Heat and Work – Study Material
Thermodynamics is the study of the connection between heat and work and the conversion of one into the other. The study is important because many machines and modern devices change heat into work (such as an automobile engine) or turn work into heat (or cooling, as in a refrigerator).
Heat and Word – Study Material
Synopsis
- Heat
- Modern definitions of heat
- Latent and sensible heat
- Specific heat
- Entropy
- Heat and Work
- Mechanical equivalent of heat
Heat:
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In Physics and Thermodynamics, heat is energy transferred from one body, region or thermodynamic system to another due to thermal contact or thermal radiation when the systems are at different temperatures.
Modern definitions of heat:
- The energy transferred from a high-temperature system to a lower-temperature system is called heat.
- Any spontaneous flow of energy from one system to another caused by a difference in temperature between the systems is called heat.
Latent and sensible heat:
- Latent heat is the heat released or absorbed by a chemical substance or a thermodynamic system during a change of state that occurs without a change in temperature.
- Such a process may be a phase transition, such as the melting of ice or the boiling of water.
- The term was introduced around 1750 by Joseph Black as derived from the Latin later (to lie hidden), characterizing its effect as not being directly measurable with a thermometer.