| 单词 | joule's law |
| 释义 | > as lemmasJoule's law Joule's law n. (a) the law that the heat produced by an electric current i flowing through a resistance R for a time t is proportional to i2Rt; (b) a law concerning ideal gases, now usually given in the form: the internal energy of a given mass of a gas depends only on its temperature. ΘΚΠ the world > matter > chemistry > physical chemistry > gaseous phase > [noun] > ideal gas > laws Joule's law1855 the world > matter > physics > electromagnetic radiation > electricity > resistance > [noun] > heating effect > law concerning Joule's law1855 1855 W. Thomson in Proc. Philos. Soc. Glasgow III. 286 We thus have an equation between the diminution of the electrical energy in any infinitely small time, and the expression according to Joule's law for the heat generated in the same time in the discharges multiplied by the mechanical equivalent of the thermal unit. 1879 Encycl. Brit. VIII. 57/1 The current of the battery heats the pile in part uniformly according to Joule's law. 1887 Encycl. Brit. XXII. 480/1 Joules law... When a gas expands without doing external work, and without taking in or giving out heat, its temperature does not change... We must therefore conclude that the internal energy of a given mass of a gas depends only on its temperature, and not upon its temperature or volume. 1945 R. H. Frazier Elem. Electr.-circuit Theory i. 21 Ohm's law and Joule's law are interdependent; either can be derived from the other. 1951 C. L. Brown Basic Thermodynamics vi. 83 For a perfect gas the internal energy is a function of temperature only. This statement, known as Joule's law after its formulator, can be expressed symbolically as u = f(T). < as lemmas |
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