A thermodynamic system or process is called adiabatic when occurs without the transfer of heat or mass of substances between a thermodynamic system and its surroundings. In an adiabatic process, energy is transferred to the surroundings only as work. The adiabatic process provides a rigorous conceptual basis for the theory used to expound the first law of thermodynamics, and as such, it is a key concept in thermodynamics.

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