<P> A hair dryer, hairdryer or blow dryer is an electromechanical device designed to blow normal or hot air over damp hair to accelerate the evaporation of water particles and dry the hair . Blow dryers allow better control over the shape and style of hair, by accelerating and controlling the formation of temporary hydrogen bonds inside each strand . These hydrogen bonds are powerful (allowing for stronger hair shaping than the sulfur bonds formed by permanent waving products) but are temporary and extremely vulnerable to humidity . They disappear with a single washing of the hair . </P> <P> Hairstyles using blow dryers usually have volume and discipline, which can be further improved by the use of styling products and hairbrushes during drying to add tension, hold and lift . </P>

How does a hair dryer dry your hair
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