Engineering Thermodynamics
Absolute zero pressure will occur

Under vacuum conditions
At a temperature of 273°K
At sea level
When molecular momentum of the system becomes zero

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Engineering Thermodynamics
A closed system is one in which

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

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