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If actual vapour pressure is 15 and saturation vapour pressure is 30, what is the relative humidity?

Answer and explanation

Correct answer: 50% (50 प्रतिशत)

The correct answer is C: 50%. Relative humidity tells us how much water vapour is actually present in the air compared with the greatest amount the air could hold at the same temperature. The formula is: relative humidity = (actual vapour pressure ÷ saturation vapour pressure) × 100. Here the actual vapour pressure is 15 and the saturation vapour pressure is 30. Therefore, relative humidity = (15 ÷ 30) × 100 = 1/2 × 100 = 50%. This means the actual vapour pressure is half the saturation vapour pressure. Option A, 30%, would require the ratio to be 0.30. Option B, 40%, would require an actual pressure of 12 out of 30. Option D, 60%, would require an actual pressure of 18 out of 30. A useful memory cue is “actual over saturation, then multiply by 100.” Do not reverse the two pressures, because that would give an incorrect value.

Related tags

Relative HumidityVapour PressureHumidity CalculationAtmospheric MoistureClimateThe SeasonsGeographyClass 9 Mcq

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