An Isolated System is a system that does not allow energy or mass to move in or out of it. Hence, Option (A) is Correct
What is an Isolated Sytem ?
A system that does not interact with its surroundings.
The total energy and/or momentumof such sstem remains constant.
In thermodynamics, isolated is usually used to indicate that the system's energy does not change.
Therefore, An Isolated System is a system that does not allow energy or mass to move in or out of it. Hence, Option (A) is Correct
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