Q.

An open system is one in which

A. heat & work cross the boundary of the system, but the mass of the working substance does not
B. mass of working substance crosses the boundary of the system but the heat & work do not
C. both the heat & work as well as mass of the working substance cross the boundary of the system
D. neither the heat & work nor the mass of the working substances cross the boundary of the system
Answer» C. both the heat & work as well as mass of the working substance cross the boundary of the system
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