hair dryer

A hair dryer is an electromechanical device designed to blow cool or hot air over wet or damp hair, in order to accelerate the evaporation of water particles and dry the hair. The usage of hair dryers also allows to better control the shape of the hair in the process of styling, by accelerating and controlling the formation of temporary hydrogen bonds inside the hair. These hydrogen bonds are very powerful (allowing for stronger hair shaping than even the sulfur bonds formed by permanent waving products), but are temporary and extremely vulnerable to humidity, so that they entirely disappear with a single washing of the hair. The hair styling appliance market has experienced steady growth between 1999 and 2005. Some of that growth is organic, stemming from the growing American population. Major innovations in the market happen only periodically, like the introduction of the ionic hair dryer in 2002, and the launch of ceramic-coated appliances in 2003. China is the leading producer of hair dryer.