Engineering Thermodynamics
The condition of perfect vacuum, i.e., absolute zero pressure can be attained at

A temperature of - 273.16°C
A negative pressure and 0°C temperature
A temperature of 273 °K
A temperature of 0°C

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Engineering Thermodynamics
An open system is one in which

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

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