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Standard XII
Chemistry
System, Surroundings, Intensive, Extensive Properties
Dew point tem...
Question

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

A
Volume
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B
Entropy
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C
Pressure
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D
Enthalpy
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Solution

The correct option is C Pressure

If a sample of unsaturated air, containing superheated water vapour, is cooled at constant pressure. The partial pressure (Pv) of each constituent remains constant until the water vapour reaches the staturated state as shown by point B. At this point B, the first drop of dew will be formed and hence the temperature at point B is called dew point temperature.

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Standard XII Chemistry
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