write the System and surrounding
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Consider a gas enclosed in a cylinder equipped with a movable piston Suppose we undertake study of change in volume of a gas and the amount of energy released or gained by a gas when the pressure is varied by putting certain mass on the piston. In this case, a gas under study is called the system.
A part of the universe under thermodynamic investigation is called the system.All other parts of the universe outside the system such as cylinder, room and others, are surroundings. The universe is made of system plus surroundings.
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