| 单词 | molecular proportion |
| 释义 | > as lemmasmolecular proportion 10. Chemistry. A weight of a substance which combines or reacts fully with the corresponding weight of another substance; the combining weight of an atom or molecule in proportion with others; = equivalent n. 3a. Also atomic proportion, molecular proportion. Now rare.See also law of multiple proportions n. at multiple adj. 2b. ΘΚΠ the world > matter > chemistry > elements and compounds > [noun] > elements > proportionalism > proportion proportion1808 proportional1825 1802 T. Thomson Syst. Chem. III. iii. iii. 199 If we attend only to the proportions in which they combine with each other, [substances] may be arranged under four classes. 1. Some seem to combine in any proportion whatever... 2. Some combine only in certain determinate proportions... 3. Some combine only in the proportions which constitute the maxima and minima.] 1808 H. Davy in Philos. Trans. (Royal Soc.) 98 12 This compound soon absorbs its full proportion of oxygene when exposed to the air. 1810 H. Davy in Philos. Trans. (Royal Soc.) 100 63 According to Mr. Dalton, there is a proportion of oxygene, the same in all protoxides, and there is a proportion of acid, the same in all neutral salts; and new proportions of oxygene and of acid, are always multiples of these proportions. 1863–72 H. Watts Dict. Chem. I. 454 Every..symbol is used to express one atomic proportion of its particular element. 1881 Med. Temp. Jrnl. 48 194 Sulphur combines with carbon, in two proportions of the former with one of the latter. 1964 N. G. Clark Mod. Org. Chem. xvi. 327 Hydrolysis with dilute hydrochloric acid yields two molecular proportions of glucose. < as lemmas |
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