| 单词 | empirical formula |
| 释义 | > as lemmasempirical formula empirical formula n. (a) a formula arrived at by observation rather than by deductive reasoning; (b) [after German empirische Formel (1834 in Jahresbericht über die Fortschritte der physischen Wissenschaften 13 186, in a translation of a Swedish text by Berzelius)] Chemistry a formula that gives the proportion or actual number of atoms of the various elements present in a compound, irrespective of their structural arrangement; opposed to rational formula. ΚΠ 1797 Encycl. Brit. XVIII. 31/1 Those [experiments] from which we must reason at present are too few and too anomalous to be the foundation of such an empirical formula. 1837 T. Richardson tr. J. Liebig Introd. First Elem. Chem. 95 C4H10O2 is the empirical formula for alcohol. 1877 Analyst 4 97 (title) Empirical formula for the volume of atmospheric air. 1904 E. B. Titchener tr. W. M. Wundt Princ. Physiol. Psychol. I. 54 A highly complex body, to which Liebreich has assigned the empirical formula C116H241N4PO22. 1950 G. D. Mouat Pract. Steel Column 9 Gordon–Rankine formula.—This empirical formula..is obsolete so far as structural work in steel is concerned. 1992 C. A. Smith & E. J. Wood Biosynthesis ii. 49 Ribose is an aldose sugar or aldopentose, whereas ribulose is the corresponding ketose sugar ketopentose. They have identical empirical formulae. 2012 Tunnelling & Underground Space Technol. 30 146/1 Empirical formulas have been developed by many researchers to estimate load bearing capacity of weak floors in underground mines. < as lemmas |
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