单词 | isosteric |
释义 | isostericadj. 1. Having equal atomic volumes. ΘΚΠ the world > matter > chemistry > atomic chemistry > [adjective] > relating to atoms > relating to volume isosteric1865 parallelosteric1865 1865–72 H. Watts Dict. Chem. III. 432 If bodies of equal atomic volume be denominated isosteric. 2. Indicating equal specific volume. ΘΚΠ the world > matter > constitution of matter > density or solidity > [adjective] > relating to measurement of specific gravity > indicating equal specific volume isosteric1900 the world > the earth > weather and the atmosphere > weather > study or science of weather > diagrams, graphs, or lines > [adjective] > specific volume or density isosteric1900 1900 V. Bjerknes in Monthly Weather Rev. (U.S.) 28 436/1 This distribution can be expressed with the help of surfaces of equal specific volume, or isosteric surfaces. 1934 D. Brunt Physical & Dynamical Meteorol. viii. 166 Any isosteric surface is also isopycnic. 1957 G. E. Hutchinson Treat. Limnol. I. v. 263 When isosteric surfaces or surfaces of equal density or specific volume do not correspond to the equigeopotential or level surfaces, a current must be flowing. 3. Physical Chemistry. Of a heat of adsorption: corresponding to a constant amount of adsorbed material as the pressure and temperature vary (equilibrium being maintained). ΘΚΠ the world > matter > chemistry > physical chemistry > thermochemistry > [adjective] > isosteric heat of adsorption isosteric1918 1918 Proc. Royal Soc. Edinb. 38 31 Freundlich..considers an ‘isosteric’ heat of adsorption where α [= number of mols. of gas adsorbed per grm. adsorbent, adsorbing at p, T] is constant, p and T variables... But it is difficult to see how we can have an isosteric heat of adsorption per mol. adsorbed, for under the defined conditions nothing is adsorbed. We have merely a readjustment of p and T. 1933 D. J. Martin Introd. Thermodynamics for Chemists xiii. 314 The isosteric heat of adsorption is such that the amount adsorbed is kept constant while the pressure and temperature are varied. 1970 Biopolymers IX. 1531 A comparison between calorimetric and isosteric heats of sorption..will indicate the degree of irreversibility of the sorption process. 4. Chemistry. Having the same number of valence electrons arranged in a similar manner. ΘΚΠ the world > matter > chemistry > atomic chemistry > [adjective] > relating to electrons > specific s1890 free1895 isosteric1919 isoelectronic1928 sigma1929 1919 I. Langmuir in Jrnl. Amer. Chem. Soc. XLI. 1544 Compounds showing a relationship to one another like that between carbon dioxide and nitrous oxide will be called isosteric compounds or isosteres. 1921 F. H. Loring Atomic Theories xv. 134 Methane is isosteric with the ammonium ion. 1938 Jrnl. Amer. Chem. Soc. 60 2628/1 In a few cases, isosteric compounds are interchangeable in serological reactions. 1971 Arch. Biochem. & Biophysics 143 252 These overall studies support the concept that the 1,4-cyclohexadienyl group is an effective isosteric replacement for a phenyl group. This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2020). < adj.1865 |
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