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For the individual piece of sports equipment, see Racket (sports equipment). For the illegal business, see Racket (crime). Not to be confused with Racquetball. R. P. Keigwin (right) with AEJ Collins the College's rackets team at Clifton College c. 1902 Rackets or racquets is an indoor racket sport played in the United Kingdom, Republic of Ireland, United States, and Canada. The sport is infrequently called "hard rackets", possibly to distinguish it from the related sport of squash (formerly called "squash rackets"). Contents 1 History 2 Manner of play 3 Court locations 3.1 United Kingdom 3.1.1 Schools 3.1.1.1 Two court venues 3.1.1.2 One court venues 3.1.2 Clubs 3.2 North America 3.2.1 Two court venues 3.2.2 One court venues 4 Tournaments 5 World champions 6 References 7 Further reading 8 External links History Boys hitting up outside the Harrow Old School (ca lat

This article is about the boiling point of liquids. For other uses, see Boiling point (disambiguation). Boiling water The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid [1] [2] and the liquid changes into a vapor. The boiling point of a liquid varies depending upon the surrounding environmental pressure. A liquid in a partial vacuum has a lower boiling point than when that liquid is at atmospheric pressure. A liquid at high pressure has a higher boiling point than when that liquid is at atmospheric pressure. For example, water boils at 100 °C (212 °F) at sea level, but at 93.4 °C (200.1 °F) at 1,905 metres (6,250 ft) [3] altitude. For a given pressure, different liquids will boil at different temperatures. The normal boiling point (also called the atmospheric boiling point or the atmospheric pressure boiling point ) of a liquid is the special case in which the vapor pressure of the li