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

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

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Engineering Thermodynamics
An isolated system is one in which

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

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