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Concepts Of Physics MCQ Edition [Volume 2]PhysicsKinetic Theory of Gases

A weather report states, "Temperature 20^ C : Relative humidity 100 % ". Determine the dew point.

Options

  1. A0^ C
  2. B20^ C
  3. C10^ C
  4. D100^ C

Correct answer

B. 20^ C

Step-by-step solution

Relative humidity is defined as the ratio of the partial pressure of water vapor in the air to the saturated vapor pressure of water at the same temperature. When the relative humidity is 100 % , the air is completely saturated with water vapor. This means the partial pressure of water vapor is equal to the saturated vapor pressure at the current temperature. The dew point is the temperature at which the air becomes saturated with water vapor. Since the air is already saturated at the given temperature of 20^ C , t

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