| 单词 | coal rank |
| 释义 | > as lemmascoal rank 10. Geology. More fully coal rank.The degree of metamorphic maturity, carbon content, and hardness of coal. ΘΚΠ the world > the earth > minerals > types of mineral > hydrocarbon minerals > [noun] > coal > degree of hardness rank1914 1914 Bull. U.S. Bureau of Mines No. 38. 4 The higher rank (‘grade’) of coal differs from the respective lower rank of the same genetic type by the effects of the greater metamorphism and devolatilization to which the higher rank of coal has been subjected. 1948 Mem. Geol. Soc. Amer. 30 55 Metamorphic rank and grade are synonymous terms denoting the stage of metamorphism reached. 1964 R. Moyer Competition in Midwestern Coal Industry ii. 10 As a general rule, coal rank decreases progressively as one moves from east to west. 1991 R. Goldring Fossils in Field iv. 68 Very bright, splintery coal is likely to be of high rank. 2011 Fuel 90 3476/1 Everything else being equal, the lower the coal rank, the greater the catalytic activity in methane cracking. < as lemmas |
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