Engineering Thermodynamics
Absolute zero pressure will occur

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

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Engineering Thermodynamics
According to First law of thermodynamics,

Work-done by a system is equal to the heat transferred by the system
Total internal energy of a system during a process remains constant
Total energy of a system remains constant
Internal energy, enthalpy and entropy during a process remain constant

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