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

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

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Engineering Thermodynamics
According to Dalton's law, the total pressure of the mixture of gases is equal to

Sum of the partial pressures of all
Sum of the partial pressures of all divided by average molecular weight
Greater of the partial pressures of all
Average of the partial pressures of all

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