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Dew point temperature is the temperature at which condensation begins when the air is cooled at constant

Dew point temperature is the temperature at which condensation begins when the air is cooled at constant Correct Answer pressure, Pressure

Explanation:

Dew point temperature (DPT): 

Water vapour in air exists in the superheated state (state 1) and the air is highly unsaturated. When it gets cool at constant pressure, it meets the saturation vapour curve where the moisture of condensation begins.

The temperature at this point is known as the dew point temperature.

Additional Information

Normally for unsaturated air: DBT > WBT > DPT

But for saturated air: DBT = WBT = DPT

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