This is because relative humidity level increases as dry-bulb temperature decreases. This temperature is measured using a specific thermometer.
The dry-bulb temperature refers to the air temperature, which can be estimated by using a thermometer exposed to the air.
The thermometer used to measure the dry-bulb temperature must be protected from radiation and moisture (i.e., the humidity of the air).
The dry bulb temperature can be considered as ambient temperature, whereas the wet-bulb temperature measures the humidity of the air.
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