An open system is one in which
(A) mass of working substance crosses the boundary of the system but the heat and work do not
(B) neither the heat and work nor the mass of the working substances cross the boundary of the system.
(C) both the heat and work as well as mass of the working substances cross the boundary of the system
(D) heat and work cross the boundary of the system, but the mass of the working substance does not
Option C is the Correct answer. Explanation: An open system is one in which both the heat and work as well as mass of the working substances cross the boundary of the system.
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