1.

Identify the correct Relative Humidity (%) of an air mass with saturation mixing ratio at 25°C is 20 grams and H2O vapour content is 5 grams1. 15%2. 30%3. 25%4. 50%

Answer» Correct Answer - Option 3 : 25%

Relative Humidity (%): The relative humidity in an air parcel is defined as the ratio of the amount of water vapor actually in the air to the maximum amount of water vapor required for saturation at a particular temperature.

  • Relative Humidity (%) = water vapor content / water vapor capacity
  • Relative Humidity (%) = U/Us
  • Saturation mixing ratio, Us: the maximum amount of water vapor that can be in the air
  • Mixing ratio, U: the ratio between the actual (measured) mass of water vapor (in the parcel) in grams and mass of dry (non-water vapor) air (in the parcel) in kilograms

Given data

  • Temperature = 250C
  • Saturation mixing ratio, Us = 20 grams
  • Mixing ration, U = 5 grams

Calculation

  • Relative Humidity = U/Us
  • RH (%) = (5/20)*100 = 100/4 = 25
  • Therefore, the correct Relative Humidity (%) is 25%.


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