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snowmaking
Snowmaking is the production of snow by forcing water and pressurized air through a "snow gun" or "snow cannon", on ski slopes. Snowmaking is mainly used at ski resorts to supplement natural snow. This allows ski resorts to improve the reliability of their snow cover and to extend their ski seasons. Indoor ski slopes often use snowmaking. They can generally do so year-round as they have a climate-controlled environment.
The production of snow requires low temperatures. The threshold temperature for snowmaking increases as humidity decreases. Wet bulb temperature is used as a metric since it takes air temperature and relative humidity into account. Snowmaking is a relatively expensive process in its energy use, thereby limiting its use.
== History ==
Art Hunt, Dave Richey, and Wayne Pierce invented the snow cannon in 1950,〔(【引用サイトリンク】title=Making Snow )〕 but secured a patent sometime later. In 1952, Grossinger's Catskill Resort Hotel became the first in the world to use artificial snow.〔(On This Day: March 25 ), BBC News, accessed December 20, 2006. "The first artificial snow was made two years later, in 1952, at Grossinger's resort in New York, USA. "〕 Snowmaking began to be used extensively in the early 1970s. Many ski resorts depend heavily upon snowmaking.
Snowmaking has achieved greater efficiency with increasing complexity. Traditionally, snowmaking quality depended upon the skill of the equipment operator. Computer control supplements that skill with greater precision, such that a snow gun operates only when snowmaking is optimal. All-weather snowmakers have been developed by IDE.〔http://www.ide-snowmaker.com/〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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