单词 | free-swelling index |
释义 | free-swelling index [`frē ´swel·iŋ `in´deks] ENGINEERING A test for measuring the free-swelling properties of coal; consists of heating 1 gram of pulverized coal in a silica crucible over a gas flame under prescribed conditions to form a coke button, the size and shape of which are then compared with a series of standard profiles numbered 1 to 9 in increasing order of swelling. |
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