Research "Heat conduction". Home experiments and tasks when studying the topic "Types of heat transfer OPOT in physics on thermal conductivity

Option 1. Equipment: Test tube with water and alcohol.

To demonstrate poor thermal conductivity of the fluid into the tube on the volume, water poured. Holding a test tube in hand at a small angle over the flame of alcohol, heat the water at the open end (Fig. 130). It is shown that the water here quickly boils, but at the bottom of large heating is not felt.

Fig. 130 Fig. 2.105 Fig. 131.

Experience 4. Gas thermal conductivity

Option 1. Equipment: two test tubes, two tubes, two rods, two balls, alcohol, tripod, suspension.

The poor thermal conductivity of air is demonstrated using two identical tubes, closed by plugs through which short rods are missed. To the ends of the rods are attached with plasticine or paraffin steel balls (Fig. 131). Test tubes over the alcohol are placed so that in one of them there was a convection, and in another thermal conductivity of air. Notice that in one test tube the ball quickly disappears from the rod.

Option 2. See fig. 2.105

Experience 5. Convection of liquids

Option 1. Equipment: Device for demonstrating fluid convection, mangartanous potassium, alcohol, tripod.

The device representing a closed glass tube (Fig. 132) is strengthened in the footage foot. (It is better to hang than clamp the tube at the bottom, because in the latter case more likely to destroy the glass.) Through the top hole of any knee, the tube is filled with water so that there are no air bubbles throughout the closed pathway inside the tube.

When performing experience in a spoon with a grid, the crystals of mangartage potassium are placed and they leave it in the knee (you can simultaneously lower two spoons with crystallines of potassium mangartage in both knees). Then, to the lower part of this knee, they bring alcohol and observe convection.

Fig. 132 Fig. 133.

Experience 6. Gas convection

Option 1. Equipment: Alcohol, matches, paper snake, metal tip.

To demonstrate gas convection, a paper snake is manufactured, which rotates in the stream of ascending hot air, which comes from an alcohol or electric stilt (Fig. 133). (When installing the snake on the edge, it is impossible to pierce paper.)

Experience 7. Heating radiation

Option 1. Equipment: Heat receiver, pressure gauge open demonstration, table lamp (or electric stove).

The heat transition connected by a tube with a demonstration pressure gauge (see Fig. 123), strengthen in a tripod opposite the emitter. As a radiating body, you can take an electric stub, a vessel with hot water, etc., on the side of the side of the heatarium in the dark side and is observed for the testimony of the pressure gauge for 1-2 minutes.

Then rotate the heat treatment with a brilliant surface to the lamp, located at the same distance from the heat transition, and for the same time they follow the testimony of the pressure gauge. Make output.

In the second series of experiments, the lamps (or distance to the emitter) reduce and re-observe the change in the testimony of the pressure gauge in the same conditions. Make output.

Option 2. See fig. 2.99; 2.101.

Question. In that case, the change in the testimony of the liquid pressure gauge

it happens faster if the heat transfer and thermarity is addressed to each other with brilliant surfaces or if they are addressed to each other with shrinking surfaces?

Fig. 123 Fig. 2.101 Fig. 2.99.

Experiments on thermal conductivity

Different solids are warm differently. It is best to make metals. But among the metals there are champions on thermal conductivity. These include the so-called "noble metals" - platinum, gold, silver.

Experience with iron nail

In a thick chock, hammer the nail and put it on the baking sheet.
On the bottom to this long nail adjacent to plasticine, or a few small carnations. Under the Hat of the nail Put a burning candle.

See: Here one carnation fell off .., the other ... the third ...
Strictly in a few, in turn.

Experience with tree

When a nail will be cooled, put it in and in the remaining hole inserting the rauchinka.
Repeat the same experience with her.

The picture will be completely different!
The end of the rays will light up, and the carnations will stay still. It turns out that the tree spends warmly much worse than iron.

Experience with glass

If you have a suitable glass wand or tube, we repeat the experience with it.
It, of course, does not burn, but the heat is not better than the tree.

Experience with spoons

Take two teaspoons: one silver, other of the nickel alloy. Attach it with drops of stearin paper clips to them. Put a spoon in the glass so that the handles with clips sticking out of it in different sides. Pour in a glass of boiling water. Spoons are warm. A silver spoon has a stearin melting, and the clip will disappear. In another spoon, the paper clip is or not to disappear, or will disappear later when the spoon is heated stronger.

Of course, spoons should be the same in shape and size. If there is no silver spoon, take those that you have, but only from different metals. Where heating will happen faster, that metal is better spent heat, better heat.

Experience with coin

Various substances are warm in different ways. It is clearly seen from a little experience.
Attach to a piece of wood coin and wrap their white paper. Apply all this for a short time to the flame of the candle so that the flame just touches the place where the coin is located above the paper. Try not to give paper to light up. But the paper still managed to charring, and she was charred around the coin.

There, where the coin itself was, a white circle was left not touched by fire. Metal coins, as a good heat-conducting material, selected the heat of the flame and fused the paper from burning.

Thermal conductivity of porous tel

Of the solids worse, the heat, plastic, wood, fabric carries out heat.

Therefore, the handles of the teapots or pan are made from plastic or wood. And if the handle is metallic, then not to burn your fingers, you have to use a rag. It also does good heat and, preventing the hand from the burn, serves as thermal insulation.

Experience

Flip the small lump wool and wrap the thermometer ball.
Now hold the thermometer for some time at a certain distance from some heater and notice how the temperature rose. Then the same lump wool squeeze and turn the thermometer ball tightly and bring to the lamp again. In the second case, mercury will rise much faster.
So, compressed wool carries out heat much better!

The high thermal insulation properties of the car gives air enclosed between flossing wool fibers (and not the wool itself). Wool warmer than wool, precisely because its fibrous structure allows you to delay even more air.

In the same principle, the production of heat-insulating materials for house-building was founded. They make as much air intervals as possible.

Heat conduction Gaza

In winter, you apply thermal insulation and wear a warm coat or a fur coat. Air, which is contained between wool or fur fibers, like all gas, poor heat conductor.

So, in order to protect anything from the cold, thermal insulation is used. But from excessive heat you have to take insulating measures. When spaceship On the descent with a huge speed flies in the atmosphere of the Earth, its walls are drunk about the air and are very heated. To maintain inside the ship from a high temperature of the crew and equipment, a thermal insulation, heat-resistant case is used. It consists of layers of poorly conductive heat of materials.

Experience 1.

It has already been said that gases are badly spent warm.
Take an aluminum plate from children's dishes, put it on a small fire and when it is stuck enough, pour half a teaspoon of water on it

Water will not evaporate instantly, as it should be expected. Water rolls on with a flat ball - spheroid at the lowest place of a plate and a castle there on a hot metal. It seems strange that water does not turn into pairs immediately. Of course, the water evaporates, but this very pair, into which the water is converted, and protects the large spheroidal drop from the hot metal. Couples in this case turns out to be excellent thermal insulation.

Experience 2.

When you state underwear, turn the iron and, if it is heated, sprinkle on it with water. It will immediately turn into small round balls, which will quickly be sorted by iron.

These small spherical droplets also did not evaporate instantly, they also defended the steam layer, "steam pillow" from the heat of iron. On this "steam pillow" water balls and passed on a hot iron.

Experience 3.

Take some small pieces of dry ice, put them on the smooth surface of the aluminum plate. Tilt the plate in different directions. Slices of dry ice will easily slide over a smooth surface. The warm surface of the aluminum plate (its temperature differs from the temperature of dry ice at least 100 degrees) helps carbon dioxide gas more violently stand out. Under the pieces of dry ice, "carbon dioxide", on them, and slide occurs.

The text of the work is placed without images and formulas.
Full version Works available in the "Work Files" tab in PDF format

1. Introduction.

The project is developed in accordance with the standard of secondary education in physics. When writing this project, the study of heat phenomena is considered, the use of them in everyday life and technique. In addition to theoretical material, much attention is paid to research work - these are experiments that answer questions "What methods can change the internal energy of the body", "the same thermal conductivity of various substances", "why the jet of warm air or liquid rise up", "why the bodies with dark the surface is stronger than "; Search and processing information, photos. Working on the project: 1 - 1.5 months. Project trains: * Practical implementation of knowledge of knowledge about thermal devices; * Formation of self-skills research activities; * development cognitive interests; * Development of logical and technical thinking; * Development of ability to independently acquire new knowledge in physics in accordance with life needs and interests;

2. The main part.

2.1. Theoretical part

In life, we really meet with thermal phenomena every day. However, we are not always thinking that these phenomena can be explained if physics is well known. In physics lessons, we became acquainted with the ways of changing internal energy: heat transfer and the performance of work on the body or the body themselves. When contacting two bodies with different temperatures, energy is transmitted from the body with more high temperatures to the body with a lower temperature. This process will occur until the tel temperature is equal to (there will be no thermal equilibrium). In this case, mechanical work is not performed. The process of changing internal energy without working on the body or the body itself is called heat exchange or heat transfer. When heat transfer, the energy is always transmitted from the more heated body to less heated. Reverse process Spontaneously (in itself) never happens, i.e., the heat exchange is irreversible. The heat exchange determines or accompanies many processes in nature: the evolution of stars and planets, meteorological processes on the ground surface, etc. Types of heat transfer: thermal conductivity, convection, radiation.

Thermal conductivitythe phenomenon of energy transmission from more heated parts of the body is less heated as a result of thermal motion and the interaction of particles from which the body consists of.

Metals have the greatest thermal conductivity - it is hundreds of times more than the water. The exceptions are mercury and lead, but also where thermal conductivity is ten times more than the water.

When lowering the metal knitting needles in a glass with hot water, the end of the knitting needles was very hot. Consequently, internal energy, like any kind of energy, can be transferred from some bodies to others. Internal energy can be transmitted from one part of the body to another. For example, if one end of the nail is heated in the flame, then its other end, which is in hand, gradually heats up and burn hand.

2.2. Practical part.

We study this phenomenon, having done a number of experiments with solid bodies, liquid and gas.

Experience number 1

They took various items: one aluminum spoon, another wooden, third - plastic, fourth - from the stainless alloy, and the fifth - silver. Attached to each spoon with drops of honey paper clips for papers. Invested spoons in a glass with hot water so that the handles with clips stick out from it in different directions. Spoons are warm, and as honey heats up will melt and the clips will disappear.

Of course, spoons should be the same in shape and size. Where heating will happen faster, that metal is better spent heat, better heat. For this experience I took a glass with boiling water and four types of spoons: aluminum, silver, plastic and stainless. I lowered them alone in a glass and kept time: for how many minutes it gets warm. That's what I did:

Conclusion: spoons made of wood and plastic, heat longer than spoons of metal, it means that the metals have good thermal conductivity.

Experience number2

We will enter the end of a wooden stick to the fire. He will ignite. The other end of the stick, which is outside, will be cold. So the tree has bad thermal conductivity.

We bring to the flame of the alcohol end thin glass sticks. After a while he warms up, the other end will remain cold. Consequently, the glass has bad thermal conductivity

If we heat the end of the metal rod in the flame, then very soon the whole rod is very hot. Hold it in your hands we can no longer.

So, the metals are well carried out heat, i.e. they have a greater thermal conductivity. On the strain-ta-ve-r-zone-tal, but in-crest-lynnogo story. On the rod through one-on-one pro-Major-ki Ver Ti-Cal-But in-crepe-les with a single wax of metallic cloves.

To the edge of the rod-nya under-no-sew candle. Whole-kiland is the edge of the rod-na-g-vas-Xya, then in the art-foal-but-stubbird pro-Ga-Vas-Sia. When the heat is up-to-ho-diet to the place of crepe-lesion of cloves from the rod-it, the ste-a-Rin Plaque, and the carnation pa-gives. We see that in Dan-Mr. experience there is no PE-RE-NO-SA-CA, SO-OT-VET-BUT, NA-BOO-DAYA-SIA Tepl-Lo-Pro-Water .

Experience number 3.

Various metals have different thermal conductivity. In the physical office there is a device with which we can make sure that different metals have different thermal conductivity. However, at home we were able to make sure that the homemade device.

Device for displaying different thermal conductivity of solids.

We made an instrument to show different thermal conductivity of solids. To do this, used an empty aluminum foil jar, two rubber rings (homemade), three segments of aluminum, copper and iron wire, tiles, hot water, 3 figures of men with raised up with hands cut out of paper.

The procedure for making the device:

wire bend in the form of the letter "g";

strengthen them on the outside of the bank with the help of rubber rings;

suspend to horizontal parts of wire segments (by means of molten paraffin or plasticine) paper men.

Checking the action of the device. Pour into the bank hot water (If necessary, warm the jar with water on the electric tile) and observe what a figurine falls first, second, third.

Results. A first figurine falls, fixed on the copper wire, the second - on aluminum, third - on steel.

Output. Different solids have different thermal conductivity.

The thermal conductivity in various substances is different.

Experience number 4.

Consider now the thermal conductivity of liquids. Take a test tube with water and get it over its upper part. Water at the surface will soon boil, and at the bottom of the test tube during this time it is just heated. So, fluid thermal conductivity is small.

Experience number 5.

We explore the thermal conductivity of gases. Dry tube put on finger and heat in flame alcohol with a snug up. Finger at the same time will not feel warmth. This is due to the fact that the distance between gas molecules is even greater than that of liquids and solid bodies. Consequently, the thermal conductivity of gases is even less.

Wool, hair, bird feathers, paper, snow and other porous bodies have bad thermal conductivity.

This is due to the fact that there are air between the fibers of these substances. And the air is a bad thermal conductory.

So under the snow is saved green grassWinter persecuted from freezing.

Experience number 6.

Fucked a small lump wool and wrapped the thermometer ball to them. And he held a thermometer for some time at a certain distance from the flame and noticed how the temperature rose. Then the same lump wool squeezed and tightly wrapped them the thermometer ball and brought to the lamp again. In the second case, mercury will rise much faster. So, compressed wool carries out heat much better!

The lowest thermal conductivity has a vacuum (space freed from air). It is explained by the fact that thermal conductivity is the transfer of energy from one part of the body to another, which occurs when the interaction of molecules or other particles. In space, where there are no particles, the thermal conductivity cannot be carried out.

3. Conclusion.

In various substances, different thermal conductivity.

Big thermal conductivity possess solid bodies (Metals), lesser - liquid, and bad - gases.

Thermal conductivity of various substances we can use in everyday life, technique and nature.

The impact phenomenon is inherent in all substances, regardless of which aggregate state they are.

Now without difficulty, I can answer and explain from a physical point of view to questions:

1. In order to birds B. cold weather Fuck your feathers?

(There is air between feathers, and the air is a bad heat conductor).

2. Why does wool clothes protect better from cold than synthetic?

(Between the fur is air, which is well conducted heat).

3. Why in winter, when the weather is cold, cats sleep, curled into the ball? (Curled into the ball, they reduce the surface area that gives heat).

4. Why do the handles of the soldering iron, irons, pans, make a pan from wood or plastic? (Tree and plastic have bad thermal conductivity, so when heating metal objects, we, holding a wooden or plastic handle, will not burn hands).

5. Why are the bushes of thermal-loving plants and bushes for winter shelter sawdust?

(Sawdust are bad heat conductors. Therefore, plants are covered with sawdusts so that they do not frozen).

6. What boots are better protected from frost: close or spacious?

(Spacious, as the air does not spend heat, it is another layer in the boot, which retains heat).

4. List of references used.

Print editions:

1.A.V. Pryskin Physics Grade 8: Drop, 2012.

2.M.I.Bludov conversation in physics Part1 -m: Education 1984.

Internet resources:

1.Http: //class-fizika.narod.ru/8_3.htm.

2.Http: //ru.wikipedia.org/wiki/%D0%A2%D0%B5%D0%BF%D0%BB%D0%BE%D0%BF%D1%80%D0%BE%D0%B2 % D0% BE% D0% B4% D0% BD% D0% BE% D1% 81% D1% 82% D1% 8C

In this lesson, the concept of thermal conductivity is considered.

Thermal conductivity is one of the types of heat transfer and is associated with the transfer of internal energy from more heated parts of the body (tel) to less heated, which is carried out by chaotic moving particles of the body.

With thermal conductivity, each of us faces when carelessly enough for the iron handle of a pan, standing on the stove. Bad thermal conductivity of air allows you to insulate the apartment for the winter with the help of double frames. And there are many such examples. Therefore, thermal conductivity is one of the most important physical thermal phenomena that we will study.

At the last lesson, we found out that heat transfer (Fig. 1) is three species: thermal conductivity, convection and radiation(Fig. 2). In this lesson, we will in more detail we will deal with the first type of heat transfer, namely thermal conductivity.

Fig. 1. Heat transmission

Fig. 2 Types of heat transfer

The thermal conductivity is peculiar to substances in all three aggregate states: solid, liquid and gaseous (Fig. 3).

Fig. 3. Thermal conductivity is characterized by all aggregate states

In this case, solid bodies (metals) (Fig. 4a), and the lowest gas (Fig. 4b), have the highest thermal conductivity.

Fig. 4 thermal conductivity coefficients of various substances

The thermal conductivity is associated with the inner structure of bodies and depends on the location of molecules, their movement and interaction between themselves (Fig. 5).

Fig. 5. The connection of thermal conductivity with the internal structure of the bodies

It is important to note that under thermal conductivity, there is no transfer of the substance, and the energy transmission from the particle to the particle or from one body to another during their direct contact occurs. Word, actually, determination of thermal conductivity.

Definition.Thermal conductivity- This is a phenomenon in which the energy is transmitted from one part of the body to another by colliding particles or with direct contact of two tel.

Fig. 6. Illustration of thermal conductivity

Studies of this phenomenon were carried out mainly by experimental. The first experiments on the study of this phenomenon carried out, apparently, still Galileo Galilee (Fig. 7).

Fig. 7. Galileo Galilee (1564-1642)

The essence of his experiments was simple: Galilee had near its thermoscope (Fig. 8) various bodies and watched the temperature change. Subsequently, he made conclusions: is it good or not?

Figure 8. Thermoscope Galilee

Definition.Thermal conductivity process- This is the process of transferring energy from one particle to another, located in close proximity to each other (Fig. 9).

Fig. 9. Thermal conductivity process

Metals have thermal conductivity above, as the particles are located close to each other (Fig. 10).

Fig. 10. Heat conduction in metals

In liquids of the molecule, though closely arranged, but are quite well insulated (Fig. 11).

Fig. 11. Heat conduction in fluids

The lowest thermal conductivity of gases: molecules are located far from each other, and to transmit energy, they need to face, therefore the energy transfer process occurs quite slowly (Fig. 12).

Fig. 12. Heat conduction in gases

Consider the experience that clearly demonstrates the thermal conductivity of metals.

A aluminum rod is horizontally enshrined on the tripod. On the rod through the same gaps vertically secured with wax wooden toothpicks. To the edge of the rod brings a candle (Fig. 13).

Since the edge of the rod is heated, and aluminum, like any other metals, has a fairly good thermal conductivity, then gradually the rod warms up. When heat comes to the place of fastening of toothpicks with a rod, stearin melts - and the toothpick falls.

Fig. 13. Demonstration of experience

We see that in this experiment there is no transfer of the substance, respectively, thermal conductivity is observed.

We considered the phenomenon of thermal conductivity, and in conclusion I would like to remind important fact: No particles - no thermal conductivity.

In the next lesson, we consider in more detail another type of heat transfer - convection.

Bibliography

1. Gentendestein L.E, Kaidalov AB, Kozhevnikov V.B. / Ed. Orlova V.A., Roizen I.I. Physics 8. - M.: Mnemozin.
2. Pryrickin A.V. Physics 8. - M.: Drop, 2010.
3. Fadeeva A.A., Zasov A.V., Kiselev D.F. Physics 8. - M.: Enlightenment.

1. Internet portal "Experiment.edu.ru" ()
2. Internet portal "Festival.1September.ru" ()
3. Internet portal "class-fizika.narod.ru" ()

Homework

1. P. 13, Paragraph 4, Questions No. 1-6, Exercise 1 (1-3). Pryrickin A.V. Physics 8. - M.: Drop, 2010.
2. Why do gases have a small thermal conductivity?
3. Why in the old kettle, after he was removed from the fire, the water cools slower than in the same new one?
4. Why do you need double window frames?
5. Why residents Central Asia During the heat we carry cotton bathrobes and dads?

When studying natural sciences in modern school, great importance is visibility. educational material. Visuality makes it possible to quickly and deeper the topic studied, helps to understand the difficulties difficult to perceive, and increases interest in the subject. Digital laboratories are new, modern equipment for various school studies of the natural science direction. With their help, it is possible to carry out work as part of the school program and completely new research. The use of laboratories significantly increases visibility, both during the work itself and in the processing of results due to new measuring instruments included in the laboratory of physics (power sensors, distance, pressure, temperature, current, voltage, illumination, sound, magnetic field, etc. ). The equipment of the digital laboratory is universally, it can be included in a variety of experimental installations, saving the time of students and teachers, encourages students to creativity, allowing you to easily change measurement parameters. In addition, the video analysis program allows you to receive data from video phrases, which allows you to use as examples and quantitatively explore real life situations filmed by students themselves and fragments of educational and popular video films.

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The only way leading to knowledge is activities. Bernard Show.

Methodical development of a demonstration experiment on the subject of physics "The amount of heat and heat capacity"

The purpose of this development: show the use of the "digital laboratory" in the educational process. Show the ability to measure the specific heat capacity of the substance

This development can be used with the explanation of the new material during the laboratory work, for holding an emergency time.

Composition of the Digital Laboratory Measuring Interface Trilink Digital Sensor Sensor

Technical support Screen and multimedia projector Tripods (2 pcs.) Test tubes (2 pcs.) Water, alcohol Temperature sensor 0- 100 ° C (2 pcs.) Metal cylinders (2 pcs.) Alcohol (2 pcs.) Menzur Kalorimeter Hot water

Experience: The difference in water and alcohol heat and alcohol is heating two cylinders in boiling water, one cylinder is lowered with a spoon for melting into a water tube, and the second in the vitro with alcohol at room temperature. After lowering the cylinders, the test tubes are required, holding the test tube for the top, quickly insert the sensor, strengthen the sensor body on the steel sheet and start mixing the fluid in the tube due to the rotation of the test tube around the sensor.

We are in the work

Using a digital laboratory in physics lessons

Thanks for attention!!!

Preview:

Municipal budgetary educational institution

Secondary school №7 Poronaysk

Methodical development of a demonstration experiment

on the subject of physics

"The amount of heat and heat capacity"

For students grade 8

MBOU SOSH №7 G. Poronaysk

Poronaysk

2014

1. Introduction

2. Home Part

3. Translation

4.Technical support

1. Introduction

I teach physics in the 7-11 classes of Poronia high School Since 1994. To instill an interest in your subject, I believe that a demonstration experiment is needed, which is an integral organic part of high school physics.

Demonstration experiments form the previously accumulated preliminary representations, which are not correct to the beginning of the study of physics. Throughout the course of physics, these experiments replenish and expand the horizons of students. They navigate the correct initial ideas about new physical phenomena and processes, disclose patterns, introduce the research methods, show the device and the effect of new devices and installations. The demonstration experiment serves as a source of knowledge, develops the skills and skills of students.

The experiment at the first time of study is of particular importance, that is, in 7-8 classes, when students first proceed to the study of physics. I think it's better to see once than hear a hundred times.

2. Home Part

The purpose of this development: show the use of the "digital laboratory" in the educational process. Consider the use of the Archimedes laboratory when studying the topic "Heat phenomena" in grade 8:

Demonstration. The amount of heat and heat capacity

The purpose of the demonstrationshow the ability to measure the specific heat capacity of the substance

During the demonstration, elements of knowledge "Number of heat", "specific heat capacity of the substance" are introduced. To form ideas about the specific heat capacity as a physical value that can be measured, it is supposed to hold a number of simple experiments.

Before conducting a series of experiments on the concept of heat capacity, students are recommended to tell about the history of the introduction of the concept of "body heat capacity" during the time when "the amount of heat" was perceived as the amount of the invisible and weightless fluid of the "heator plant", and the temperature is as a measure of the fluid level in the body. The "body heat capacity" was considered a coefficient of proportionality between the temperature and the amount of "heat vehicle" flowing in the body. More vessel capacity, less than changing fluid in it, more body heat capacity is less than change in temperature in it.

However, it turned out that with the same mass of bodies from different substances, with the same amount of heat obtained from another body, their temperature varies in different ways. Therefore, the concept of the specific heat capacity of the substance was conducted, and the "body heat capacity" was calculated as a product of body weight on the specific heat capacity of the substance from which it was made.

According to modern concepts, the amount of heat Q is a change in the internal energy of the body in conditions when the body does not work. The heat capacity of the proportionality ratio between the amount of heat obtained or given by the body and the change in its temperature.

To estimate the heat capacity of a certain substance compared to other (water), the same mass (water and alcohol) report the same amount of energy and register a change in temperature, which was caused by adding this energy.

Experience: the difference in water and alcohol heat capacity

The conclusion that water heat capacity is greater than the heat capacity of the alcohol, it can be done showing that the alcohol is heated on the same amount of heat more Degree.

Heating is two cylinders in boiling water, one bar is lowered with the help of spoons for melting into a tube with water, and the second is in a vitro with alcohol at room temperature.

After laying the cylinders, the test tube is required, holding the test tube for the upper part to quickly paste the sensor, strengthen the sensor body on the steel sheet and start mixing the fluid in the tube due to the rotation of the test tube around the sensor. The graph shows the recession of the sensor temperature below the room by evaporating the fluid on the tip of the sensor, then the splash to the maximum value, by heating the water and the sensitive element of the sensor near the hot cylinder, and then the output to the stationary value due to the mixing of the fluid in the test tube. As you can see the observed change in temperature, it does not reach the desired difference corresponding to the difference in heat-capacity (about 2 times).

For approximation to the required values, it is recommended to conduct an experiment with cylinders heated to a temperature not higher than 800 C because the alcohol boils at 870 C. The exact numerical value of the initial temperature of the cylinders is irrelevant, if only it was approximately the same.

3. Translation

• Increased knowledge due to active activities Pupils in the course of experimental research work

• Automatic data collection throughout the experiment allows you to save time on recording

• Experiment Results - Visual: The data are displayed in the form of a graph, tables, analog board and digital form
• Possess portability

• Convenient processing of results allow you to obtain data inaccessible in traditional training experiments

4.Technical support

screen and multimedia projector

• tripods (2 pcs.)
• alcohol (2 pcs.)
• test tubes (2 pcs.)
• water, alcohol
• temperature sensor 0-00° C (2 pcs.)

5.Prigids used literature

• Pryrickin A. V. "Physics - 8"
• Volkov V. A. "Pounding development in physics 8 CL"
• "Physics lessons using information technologies»Moscow, Globus, 2009.
• Razumovsky V. G. "Lessons of Physics in the Modern School"
• A.N. Bulgarian and others. "Digital Laboratory" Methodical manual for working with a set of equipment and software of the company 2 Activities "m., 2011.89c.
• URL: http://www.int-edu.ru.
• URL: http://mytest.klyaksa.net