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Isothermic process

Isothermic process If a gas in a cylinder is compressed isothermally, a quantity of heat that is equal to the applied work must be gradually led off. This is practicaly impossible, as such a slow process can not be realised.
The relation for the quantitu of heat led off is:
Isothermic change of state means that the temperature of a gas mixture is constant, when the pressure and volume are changed.