| 单词 | black heat |
| 释义 | > as lemmasblack heat black heat n. a degree of heat or a temperature that is not sufficiently warm enough to produce visible light; cf. red heat n. 2; white heat n. 1. ΘΚΠ the world > matter > properties of materials > temperature > heat > [noun] > specific degree of heat red heatc1540 fury fire1644 adustness1652 white heat1664 blood heat1678 welding heat1710 black heat1800 welding1842 boiling-heat1846 red-hot1865 melting heat1868 1800 W. Herschel in Philos. Trans. (Royal Soc.) 90 306 I therefore placed a poker, when of a proper black heat, at 12 inches from the steel mirror. 1888 Trans. Inst. Engineers & Shipbuilders Scotl. 31 91 A sheet of copper was brought to a black heat and allowed to cool gradually. 1950 N.Z. Jrnl. Agric. 81 199 The searing or docking iron must be at ‘black heat’, not red hot. 2005 C. McRaven Blacksmith's Craft iv. 78 For a blacksmith's finish on your tongs, heat to a black heat, which is just under darkest red, and dip into oil. < as lemmas |
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