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

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Engineering Thermodynamics
The door of a running refrigerator inside a room was left open. Which of the following statements is correct?

The room will be gradually warmed up
The room will be cooled to the temperature inside the refrigerator
The room will be cooled very slightly
The temperature of the air in room will remain unaffected

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