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The wet bulb depression is zero, when relative humidity is equal to

The wet bulb depression is zero, when relative humidity is equal to Correct Answer 100%

Concept:

Dry bulb temperature (DBT): It is the temperature of moist air measured by an ordinary thermometer

Wet bulb temperature (WBT): It is the temperature of air shown by a thermometer whose bulb is covered with wet cloth.

Wet Bulb Depression (WBD): It is the difference between dry bulb temperature and wet bulb temperature.

WBD = DBT - WBT

Now WBD = 0

So DBT = WBT which happens when the air is fully saturated. So the relative humidity is 100 %.

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