| 单词 | roll sulphur |
| 释义 | > as lemmasroll sulphur roll sulphur n. sulphur in the form of sticks or blocks, made by allowing liquid sulphur to solidify in (esp. cylindrical) moulds. ΚΠ 1712 J. Browne tr. P. Pomet et al. Compl. Hist. Druggs II. iv. 391/1 Sulphur..is twofold, viz. Natural and Artificial, the Roll Sulphur is the latter. 1866 Philos. Trans. (Royal Soc.) 156 84 Ordinary roll sulphur, even in thin cakes, allows no radiant heat to pass through it. 1982 G. C. Hill & J. S. Holman Chem. in Context: Lab. Man. & Study Guide 78 Add 50 cm3 of distilled water and 1.5 g of powdered roll sulphur. roll sulphur Sulphur exists in two distinct crystalline forms and in an amorphous form. It is manufactured largely from native sulphides of copper and iron; when refined and cast into moulds, it is the roll sulphur or stick sulphur of commerce. It is highly inflammable, and is used in the manufacture of matches, gunpowder, and sulphuric acid, for vulcanizing rubber, in bleaching, and as a disinfectant.< as lemmas |
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