If the air has 100% relative humidity, how many degrees does it have to cool down for condensation/dew to start to form?
1 Answer
May 29, 2018
It doesn't. If it is 100% humidity it already has cooled enough for condensation.
Explanation:
At 100% humidity the air is saturated. The air can not hold anymore water vapor than it is presently dissolving.
Warm air having greater kinetic energy can dissolve or hold more water vapor than colder air. Colder air has less energy so can hold less water vapor than warmer air.
When there is 100% humidity the dew point is already reached so condensation occurs.
