Engineering Thermodynamics
Boyle's law i.e. pV = constant is applicable to gases under

All ranges of pressures
Steady change of pressures
Only small range of pressures
High range of pressures

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Engineering Thermodynamics
According to First law of thermodynamics,

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

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