water equivalentn.

Brit.

/ˈwɔːtə(r) ᵻˌkwɪvələnt/, U.S.

/ˈwɔdər əˌkwɪv(ə)lənt/,

/ˈwɔdər iˌkwɪv(ə)lənt/,

/ˈwɑdər əˌkwɪv(ə)lənt/,

/ˈwɑdər iˌkwɪv(ə)lənt/

Origin: Formed within English, by compounding. Etymons: water n., equivalent n.

Etymology: < water n. + equivalent n.

†a. The volume of water necessary to produce a given quantity of steam. Obsolete.

ΚΠ

1852 Inst. Mech. Engineers: Proc. 69 Therefore the volume of water as steam, or the water equivalent of the steam admitted, is..6.24 cubic inches.

b. Meteorology. More fully snow water equivalent. The amount of precipitation represented by a quantity of snow, sleet, or ice.

ΚΠ

1897 Geogr. Jrnl. 9 557 The observations with regard to the water-equivalent of snow are of special interest.

1912 Monthly Weather Rev. (U.S.) 40 29/1 The total amount of precipitation for the month, that is, the rainfall plus the water equivalent of the snowfall, was somewhat below the January normal.

1942 Weather Observer (Techn. Man., U.S. War Dept., No. 1-235) 92 Measure the remainder of the melted snow or sleet..to obtain the ‘water equivalent’.

1972 Jrnl. Range Managem. 26 33/3 Relationships of herbage production to peak snow water equivalent were not significant.

2011 Times (Nexis) 18 Jan. (Features section) 55 The huge snowfalls last month amounted to very little precipitation because the water equivalent of snow is roughly a tenth of that of rain.

2. Physics. The amount of water, measured in terms of mass, which requires the same amount of heat as a given body in order to raise its temperature by the same amount. Now rare.The water equivalent of a particular body is calculated by multiplying the mass of the body by its specific heat.

ΚΠ

1875 Proc. Royal Soc. 1874–5 23 489 The water-equivalent of the instrument was only 15.72 grammes.

1921 E. S. Ferry Gen. Physics xiv. 257 If the mass of the body and the thermal capacity per unit mass be unknown, the water equivalent can be experimentally determined.

1982 J. L. Heilbron Elements Early Mod. Physics i. 76 Careful measurements, taking into account what we would call the water equivalent of the instruments, confirmed Richmann's universal equation.

This is a new entry (OED Third Edition, September 2015; most recently modified version published online December 2021).

单词	water equivalent
释义	water equivalentn. Brit. /ˈwɔːtə(r) ᵻˌkwɪvələnt/, U.S. /ˈwɔdər əˌkwɪv(ə)lənt/, /ˈwɔdər iˌkwɪv(ə)lənt/, /ˈwɑdər əˌkwɪv(ə)lənt/, /ˈwɑdər iˌkwɪv(ə)lənt/ Origin: Formed within English, by compounding. Etymons: water n., equivalent n. Etymology: < water n. + equivalent n. 1. †a. The volume of water necessary to produce a given quantity of steam. Obsolete. ΚΠ 1852 Inst. Mech. Engineers: Proc. 69 Therefore the volume of water as steam, or the water equivalent of the steam admitted, is..6.24 cubic inches. b. Meteorology. More fully snow water equivalent. The amount of precipitation represented by a quantity of snow, sleet, or ice. ΚΠ 1897 Geogr. Jrnl. 9 557 The observations with regard to the water-equivalent of snow are of special interest. 1912 Monthly Weather Rev. (U.S.) 40 29/1 The total amount of precipitation for the month, that is, the rainfall plus the water equivalent of the snowfall, was somewhat below the January normal. 1942 Weather Observer (Techn. Man., U.S. War Dept., No. 1-235) 92 Measure the remainder of the melted snow or sleet..to obtain the ‘water equivalent’. 1972 Jrnl. Range Managem. 26 33/3 Relationships of herbage production to peak snow water equivalent were not significant. 2011 Times (Nexis) 18 Jan. (Features section) 55 The huge snowfalls last month amounted to very little precipitation because the water equivalent of snow is roughly a tenth of that of rain. 2. Physics. The amount of water, measured in terms of mass, which requires the same amount of heat as a given body in order to raise its temperature by the same amount. Now rare.The water equivalent of a particular body is calculated by multiplying the mass of the body by its specific heat. ΚΠ 1875 Proc. Royal Soc. 1874–5 23 489 The water-equivalent of the instrument was only 15.72 grammes. 1921 E. S. Ferry Gen. Physics xiv. 257 If the mass of the body and the thermal capacity per unit mass be unknown, the water equivalent can be experimentally determined. 1982 J. L. Heilbron Elements Early Mod. Physics i. 76 Careful measurements, taking into account what we would call the water equivalent of the instruments, confirmed Richmann's universal equation. This is a new entry (OED Third Edition, September 2015; most recently modified version published online December 2021). < n.1852
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