Engineering Thermodynamics
Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?

O₂, N₂, water vapour
O₂, N₂, H₂, air
O₂, N₂, steam, CO₂
SO₂, NH₃, CO₂, moisture

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can

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Engineering Thermodynamics
Gases have

Only one value of specific heat
No value of specific heat
Under some conditions one value and sometimes two values of specific heat
Two values of specific heat

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