A ski is a long flat device worn on the feet designed to help the wearer slide smoothly over snow. Originally intended as an aid to travel in snowy regions, they are now primarily used for recreational and sporting purposes. Also, a ski may denote a similar device used for other purposes than skiing, for example, for steering snowmobiles.
Snow skis glide on snow because downward pressure, as well as heat from surface friction, melts a thin layer of snow directly under the ski. This creates a very thin layer of water directly under the ski upon which the ski glides. Ski wax is used to decrease drag by increasing the water repellent properties of the base.
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The original Nordic ski technology was improved during the early twentieth century so that skiers could make turns at higher speeds. New ski and binding designs, coupled with the introduction of ski lifts and snow cats to carry skiers high up on mountains, enabled the development of most prominent category of the sport, alpine skiing.
