light watern.

Brit.

/ˌlʌɪt ˈwɔːtə/, U.S.

/ˌlaɪt ˈwɔdər/,

/ˌlaɪt ˈwɑdər/

Origin: Formed within English, by compounding. Etymons: light adj.¹, water n.

Etymology: < light adj.¹ + water n.

1. Water containing the normal (about 0·02%), or less than the normal, proportion of deuterium oxide. Cf. heavy water n. at heavy adj.¹ 2d. light water reactor n. a nuclear reactor in which the moderator is light water.

ΘΚΠ

the world > matter > chemistry > chemical substances > named compounds > [noun] > water

waterOE

oxyhydric acid1848

light water1933

the world > matter > physics > atomic nucleus > nuclear fission > nuclear reactor > [noun] > cooled by water

pressurized-water reactor1953

PWR1954

light water reactor1956

LWR1974

1933 Science 29 Dec. 602/1 In fact, if there were only two waters, two ammonias, and so forth, the names ‘light water’, ‘heavy water’, ‘light ammonia’ and ‘heavy ammonia’ would be very satisfactory indeed.

1947 J. G. Crowther & R. Whiddington Sci. at War iii. 142 Vast quantities of water have been electrolysed, and separated into ‘light water’ and ‘heavy water’, the former containing hydrogen atoms of mass 1 only.

1956 Nature 4 Feb. 204/1 Studies have been made of the pressurized light-water reactor and of the sodium-graphite reactor.

1980 Radioactive Waste Processing & Disposal (U.S. Nuclear Regulatory Comm.) 421/1 This standard presents minimum design requirements of facilities for the storage and preparation for shipment of spent fuel from light-water moderated and cooled nuclear power stations.

2015 Daily Tel. 14 Aug. 13/3 Uranium from the plant could be used in North Korea's experimental light-water nuclear reactor in its Yongbyon research plant.

2. A foam used in firefighting which floats on flammable liquids lighter than water, formed by mixing water with a fluorocarbon surfactant.

ΘΚΠ

the world > matter > properties of materials > temperature > coldness > extinguishing fire > [noun] > fire-fighting > a substance or apparatus for extinguishing > foam

foam1907

air foam1937

light water1964

1964 R. L. Tuve et al. New Vapor-Securing Agent for Flammable-Liquid Fire Extinguishm. (U.S. Naval Res. Lab. Rep. 6057) 38 Since it was also a practical necessity that these foams and their films be easily differentiated from the existing protein types of fire fighting foams, it became expedient in the laboratory to refer to the new material as ‘Light Water’.

1972 Aircraft Engin. Jan. 28/1 Using Light Water aqueous film forming foam, the team cut a knock-down path to the cockpit within five seconds of reaching the fire.

1994 Guardian (Nexis) 4 Aug. (Sport section) The fire was swamped by light water foam delivered from a huge pool of extinguishant which regulations demand be stationed in each pit.

This entry has been updated (OED Third Edition, December 2021).

单词	light water
释义	light watern. Brit. /ˌlʌɪt ˈwɔːtə/, U.S. /ˌlaɪt ˈwɔdər/, /ˌlaɪt ˈwɑdər/ Origin: Formed within English, by compounding. Etymons: light adj.¹, water n. Etymology: < light adj.¹ + water n. 1. Water containing the normal (about 0·02%), or less than the normal, proportion of deuterium oxide. Cf. heavy water n. at heavy adj.¹ 2d. light water reactor n. a nuclear reactor in which the moderator is light water. ΘΚΠ the world > matter > chemistry > chemical substances > named compounds > [noun] > water waterOE oxyhydric acid1848 light water1933 the world > matter > physics > atomic nucleus > nuclear fission > nuclear reactor > [noun] > cooled by water pressurized-water reactor1953 PWR1954 light water reactor1956 LWR1974 1933 Science 29 Dec. 602/1 In fact, if there were only two waters, two ammonias, and so forth, the names ‘light water’, ‘heavy water’, ‘light ammonia’ and ‘heavy ammonia’ would be very satisfactory indeed. 1947 J. G. Crowther & R. Whiddington Sci. at War iii. 142 Vast quantities of water have been electrolysed, and separated into ‘light water’ and ‘heavy water’, the former containing hydrogen atoms of mass 1 only. 1956 Nature 4 Feb. 204/1 Studies have been made of the pressurized light-water reactor and of the sodium-graphite reactor. 1980 Radioactive Waste Processing & Disposal (U.S. Nuclear Regulatory Comm.) 421/1 This standard presents minimum design requirements of facilities for the storage and preparation for shipment of spent fuel from light-water moderated and cooled nuclear power stations. 2015 Daily Tel. 14 Aug. 13/3 Uranium from the plant could be used in North Korea's experimental light-water nuclear reactor in its Yongbyon research plant. 2. A foam used in firefighting which floats on flammable liquids lighter than water, formed by mixing water with a fluorocarbon surfactant. ΘΚΠ the world > matter > properties of materials > temperature > coldness > extinguishing fire > [noun] > fire-fighting > a substance or apparatus for extinguishing > foam foam1907 air foam1937 light water1964 1964 R. L. Tuve et al. New Vapor-Securing Agent for Flammable-Liquid Fire Extinguishm. (U.S. Naval Res. Lab. Rep. 6057) 38 Since it was also a practical necessity that these foams and their films be easily differentiated from the existing protein types of fire fighting foams, it became expedient in the laboratory to refer to the new material as ‘Light Water’. 1972 Aircraft Engin. Jan. 28/1 Using Light Water aqueous film forming foam, the team cut a knock-down path to the cockpit within five seconds of reaching the fire. 1994 Guardian (Nexis) 4 Aug. (Sport section) The fire was swamped by light water foam delivered from a huge pool of extinguishant which regulations demand be stationed in each pit. This entry has been updated (OED Third Edition, December 2021). < n.1933
随便看	municipalism municipalisms municipalist municipalists municipalities municipality municipalization municipalizations municipalize municipalized municipalizer municipalizes municipalizing municipally municipally operated municipally owned municipals municipia municipio municipium municipy muniferous munific munifical munificate