Heat is transferred from the surrounding to the closed system, then what is the change in internal energy ?
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The internal energy of a system can be changed by transfers of matter or heat or by doing work.[3] When matter transfer is prevented by impermeable containing walls, the system is said to be closed. Then the first law of thermodynamics states that the increase in internal energy is equal to the total heat added plus the work done on the system by its surroundings. If the containing walls pass neither matter nor energy, the system is said to be isolated and its internal energy cannot change. The first law of thermodynamics may be regarded as establishing the existence of the internal energy.
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