When the room temperature becomes equal to the dew point, the relative humidity of the room is

100

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Zero%

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70

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85

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Solution

The correct option is A $100$ %
Relative humidity is the ratio of water vapor pressure and saturation vapor pressure at the present temperature.
When the room temperature becomes equal to the dew point, then the air is saturated. Hence the relative humidity of room is $100$ %.

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When the room temperature becomes equal to the dew point, the relative humidity of the room is

The correct option is A 100%Relative humidity is the ratio of water vapor pressure and saturation vapor pressure at the present temperature.When the room temperature becomes equal to the dew point, then the air is saturated. Hence the relative humidity of room is 100 %.

The correct option is A $100$ %
Relative humidity is the ratio of water vapor pressure and saturation vapor pressure at the present temperature.
When the room temperature becomes equal to the dew point, then the air is saturated. Hence the relative humidity of room is $100$ %.