EXTREME FACTS: HUMIDITY Hotter air can hold more water vapour than cold, so as the air temperature falls the relative humidity rises. When it reaches 100% it is known as the Dew Point and condensation will occur Even desert environments can have high atmospheric humidity, which can soon reach 100% when equipment is brought out from air-conditioning Condensation causes tape to stick to the rotary drum, which can be catastrophic Most machines will employ a condensation sensor that can prevent ope.