The branch of physics that deals with heat transfer and other forms of energy with the surroundings. A thermodynamic process is defined as a change from one equilibrium one state to another state.
Isothermal process
In an isothermal process the system changes itself from one state to another keeping temperature as a constant. That is, temperature is neither released nor transferred to the surroundings. For example, the temperature of the hot water does not change inside a thermos, because it acts as an isothermal system.
Adiabatic system
In an adiabatic process there is no exchange of heat energy. For example, the air in the atmosphere flows in such a way that it expands and cools when flowing upwards. Similarly when the air flows downwards it contracts and becomes warm.
Isochoric process
The process during which the volume of the system remains constant is called an isochoric process. For example, when a closed cylinder is heated, the volume of the gas inside the cylinder remains constant.
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