Engineering Thermodynamics
An isolated system is one in which

Neither mass nor energy crosses the boundaries of the system
Mass crosses the boundary but not the energy
Both energy and mass cross the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so

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Engineering Thermodynamics
The door of a running refrigerator inside a room was left open. Which of the following statements is correct?

The room will be cooled to the temperature inside the refrigerator
The temperature of the air in room will remain unaffected
The room will be gradually warmed up
The room will be cooled very slightly

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