Question
Ratio of mass of water vapour actually present in the air to a unit mass of air, including water vapours is best referred to as :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
Specific humidity
Defining Specific Humidity in Air
The question asks for the term that describes the ratio of the mass of water vapour present in the air to the total mass of air, including the water vapour itself.
Analyzing Humidity Measures
Let's examine the given options:
- Mixing ratio: This is the ratio of the mass of water vapour to the mass of dry air. It doesn't include the mass of water vapour in the denominator.
- Relative humidity: This is a percentage comparing the actual amount of water vapour in the air to the maximum amount the air can hold at a specific temperature. It's not a direct mass ratio.
- Specific humidity: This is defined as the ratio of the mass of water vapour ($m_v$) to the total mass of moist air ($m_{total} = m_{dry} + m_v$). This perfectly matches the question's description. The formula is: $q = \frac{m_v}{m_{total}}$.
- Vapour pressure: This is the partial pressure exerted by water vapor molecules in the air. It's a measure of pressure, not a mass ratio.
Conclusion on Air Vapor Ratio
Based on the definitions, the term that best fits the description "Ratio of mass of water vapour actually present in the air to a unit mass of air, including water vapours" is Specific humidity.
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