| 单词 | erg |
| 释义 | ▪ I. erg1 Physics.|ɜːg|
Also ergon.
[ad. Gr. ἔργ-ον work.]
1. A unit of work or energy; the amount of work done when a force of one dyne moves its point of application one centimetre in the direction of the force.
1873Brit. Assoc. Rep. 224 We propose to denote it [the C.G.S. unit of work] by some derivative of the Greek ἔργον. The forms ergon, ergal and erg have been suggested..We propose, for the present, to leave the termination unsettled; and we request that the word ergon or erg be strictly limited to the C.G.S. unit of work, or what is for purposes of measurement, equivalent to this the C.G.S. unit of energy. 1874Maxwell in Life (1882) 632 Your sum of Vital energy Is not the millionth of an erg. 1875Garnett Elem. Dynamics (1889) §63 The C.G.S. unit of work is that done by a dyne in working through a centimetre and is called an erg.
2. Comb. as erg-nine, erg-ten, the product of an erg multiplied respectively by 109 and 1010.
1873Brit. Assoc. Rep. 224 One horse-power is equal to three quarters of an erg-ten per second. More nearly, it is 7·46 erg-nines per second.
▪ II. ‖ erg2|ɜːg|
Pl. areg, ergs.
[Fr. (E. Fromentin Un été dans le Sahara (1857),) f. N. Afr. Arabic ‘irj, of Berber origin.]
A type of desert area in the Sahara consisting of shifting sand dunes.
Fromentin's book appeared in serial form in the Revue de Paris 1854.
1875Encycl. Brit. I. 250/1 The most truly desert region of the Sahara is an irregular belt of shifting sand dunes, the ‘Erg’ or ‘Areg’. 1937Wooldridge & Morgan Physical Basis Geogr. xx. 301 The sand areas of the Old World deserts (‘Erg’ of the Sahara, ‘Koum’ of Asia). Ibid. 319 It was at a later date..that the red Kalahari sands extended widely in South Africa. They appear to represent an ‘erg phase’. 1943Algeria (Naval Intelligence Div.) I. ii. 27 The sand-dune areas are called ergs. Ibid. v. 155 Two fairly distinct types [of sand desert] can be distinguished: the nebkas or small areas of sand,..and the erg (pl. areg) or large dune system... The erg consists of drinn steppe with a drought-resisting grass as the dominant species. 1950G. Brenan Face of Spain ix. 195 He..had spent his life among the sand ergs and ashab pastures of the Sahara. |
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