Engineering Thermodynamics
The absolute zero pressure will be

When molecular momentum of the system becomes zero
At sea level
At the center of the earth
At the temperature of - 273 K

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Engineering Thermodynamics
According to First law of thermodynamics,

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

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