The Complete Guide to Hand Dryers A hand dryer is a device that is used to dry hands. It works by using a either a button to press to emit air or a sensor to automatically detect when to blow warm air over the hands to evaporate the water on the skin. It usually takes between 15-30 seconds for all the water to evaporate and the hands to be fully dried. Cool, right?
Fun fact: The very first hand dryer was invented in 1887 by American inventor George Greenough. It was made of wo