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| 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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