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单词 steam point
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steam point
steam point n. (a) a temperature at which liquid water and water vapour are in equilibrium; spec. the boiling point of water under standard atmospheric pressure; (b) North American a metal pipe which is driven into frozen earth and down which steam can be passed in order to thaw the ground for mining.
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society > occupation and work > equipment > mining equipment > [noun] > other mining equipment
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the world > matter > chemistry > physical chemistry > phases > [noun] > steam point
steam point1895
1895 Jrnl. Chem. Soc. 67 196 It is absolutely necessary that the surface of the pyrometer should be free from all soluble salts when the steam point is being taken.
1903 Philos. Trans. (Royal Soc.) A. 200 122 The observed pressure at the steam-point.
1909 Yukon Territory (Canada Dept. Interior) iv. 38 A steam point is an iron pipe of about 5½ feet in length,..connected to a boiler supplying the steam... The miner drives the steam point into the ground, where it is left..until a hole is thawed.
1965 Jrnl. Chem. Physics 42 274/2 In 1954 the size of the Kelvin degree was fixed by assigning the value 273·16°K to the triple point of water, so that the value of the steam point is now subject to experimental determination.
1974 W. R. Hunt North of 53° iv. 15 Steam points replaced wood fires for thawing and this greatly speeded the mining work.
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