Humidity ratio (specific humidity): choose the correct basis Define humidity ratio/specific humidity as the mass of water vapour present in which reference amount? Choose the correct basis.
Mechanical Engineering
Heat Transfer, Refrigeration and Air Conditioning
Difficulty: Easy
Choose an option
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A1 m³ of wet air
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B1 m³ of dry air
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C1 kg of wet air
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D1 kg of dry air
Answer
Correct Answer: 1 kg of dry air
Explanation
DefinitionSpecific humidity (also called humidity ratio) ω is the mass of water vapour per unit mass of dry air: ω = mv / ma (kg/kg dry air).
Why other options are incorrect
- Options A and B refer to absolute humidity (per unit volume).
- Option C uses total wet-air mass; standard ω uses mass of dry air as the reference.
Final Answer1 kg of dry air