![Page 1: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/1.jpg)
PHYSICSNEET and JEE Main 2020 : 45 Days Crash Course
Calorimetry, Thermal Expansionand Heat Transfer
By,Ritesh Agarwal, B. Tech. IIT Bombay
![Page 2: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/2.jpg)
Heat
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
The energy that is being transferred between two bodies or between adjacent parts of a body as aresult of temperature difference is called heat. Thus, heat is a form of energy. It is energy in transitwhenever temperature differences exist.
Once it is transferred, it becomes the internal energy of the receiving body. It should be clearlyunderstood that the word "heat" is meaningful only as long as the energy is being transferred.
Thus, expressions like "heat in a body" or "heat of a body" are meaningless.
![Page 3: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/3.jpg)
Specific Heat
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
Specific heat of substance is equal to heat gain or released by that substance to raise or fall itstemperature by 1° C for a unit mass of substance.
![Page 4: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/4.jpg)
Example
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
Sol.Find amount of heat required to increases the temperature of 1 kg water by 20° C
![Page 5: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/5.jpg)
Heat Capacity or Thermal Capacity
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
Heat capacity of a body is defined as the amount of heat required to raise the temperature of that bodyby 1°.
![Page 6: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/6.jpg)
Phase Change and Latent Heat
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
![Page 7: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/7.jpg)
Graph of Phase Change
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
![Page 8: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/8.jpg)
Calorimetry
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
The branch of thermodynamics which deals with the measurement of heat is called calorimetry.
![Page 9: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/9.jpg)
Example
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
Sol.
![Page 10: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/10.jpg)
Thermal Expansion
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
Most materials expand when their temperature is increased.Thermal expansion is like a photographic enlargement
![Page 11: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/11.jpg)
Example
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
Sol.
![Page 12: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/12.jpg)
Variation of Time Period of Pendulum Clocks
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
![Page 13: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/13.jpg)
Example
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
Sol.
![Page 14: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/14.jpg)
Variation of Density with Temperature
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
![Page 15: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/15.jpg)
Anomalous Expansion of water
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
![Page 16: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/16.jpg)
Comparison between Different Temperature Scales
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
![Page 17: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/17.jpg)
Example
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
Sol.
![Page 18: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/18.jpg)
Heat Transfer
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
Heat is energy in transit which flows due to temperature difference; from a body at higher temperatureto a body at lower temperature. This transfer of heat from one body to the other takes place throughthree routes.
(i) Conduction(ii) Convection(iii) Radiation
![Page 19: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/19.jpg)
Conduction
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
The process of transmission of heat energy in which heat is transferred from one particle of the mediumto the other, but each particle of the medium stays at its own position is called conduction.
![Page 20: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/20.jpg)
Thermal Resistance to Conduction
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
![Page 21: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/21.jpg)
Slabs in Parallel and Series
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
![Page 22: 12. Calorimetry, Thermal Expansion and Heat Transfer...2020/05/30 · Sol. Find amount of heat required to increases the temperature of 1 kg water by 20 C Heat Capacity or Thermal](https://reader036.vdocuments.us/reader036/viewer/2022071405/60fa80fec826df4a4d364bce/html5/thumbnails/22.jpg)
Convection
Physics by Ritesh Agarwal (B. Tech. IIT Bombay)
When heat is transferred from one point to the other through actual movement of heated particles, theprocess of heat transfer is called convection. In liquids and gases, some heat may be transportedthrough conduction. But most of the transfer of heat in them occurs through the process of convection.Convection occurs through the aid of earth’s gravity.