The field of science, which deals with the energies possessed by gases and vapours, is known as Thermodynamics. It also includes the conversion of these energies in terms of heat and mechanical work and their relationship with properties of the system. A machine, which converts heat into mechanical work or vice versa, is known as Heat Engine. The field of engineering science, which deals with the applications of Thermodynamics and its laws of work producing and work absorbing devices in order to understand their function and improve their performance, is known as Thermal Engineering.(modern refrigeration)
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