______ is defined as the temperature to which the air would have to cool (at constant pressure and constant water vapour content) in order to reach saturation.

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SSC CGL 2021 Tier-I (Held On : 13 April 2022 Shift 2)
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  1. Surface temperature
  2. Air temperature
  3. Dew point temperature
  4. Relative humidity

Answer (Detailed Solution Below)

Option 3 : Dew point temperature
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PYST 1: SSC CGL - English (Held On : 11 April 2022 Shift 1)
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Detailed Solution

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The correct answer is Dew point temperature.

Key Points

  • Dew point temperature (DPT):
    • It is a temperature at which moisture present in the atmosphere starts condensing or it is the temperature at which the first droplet of moisture is formed.
    • As we know that for each pressure, the air has a specific saturation temperature, therefore for fully saturated air DBT, WBT and DPT are equal.
    • When the relative humidity of the air is 100%, i.e the air is saturated, the dew point temperature (DPT) equals the wet-bulb temperature (WBT), which is also equal to the dry-bulb temperature.
    • So DBT = WBT = DPT

Additional Information

  • Relative humidity:
    • It is defined as the ratio of the mass of vapour to the mass of vapour under saturation conditions.
    • Relative humidity represents vapour absorption capacity.
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