Engineering Thermodynamics
For a perfect gas, according to Boyle’s law (where P = Absolute pressure, V = Volume and T = Absolute temperature)

T/P = constant, if v is kept constant
P v = constant, if T is kept constant
P/T = constant, if v is kept constant
V/T = constant, if p is kept constant

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Engineering Thermodynamics
Extensive property of a system is one whose value

Is dependent on the path followed and not on the state
Does not depend on the mass of the system, like temperature, pressure, etc.
Depends on the mass of the system like volume
Is not dependent on the path followed but on the state

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Engineering Thermodynamics
According to First law of thermodynamics,

Internal energy, enthalpy and entropy during a process remain constant
Total internal energy of a system during a process remains 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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