first law of thermodynamics

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first law of thermodynamics

[′fərst ‚lȯ əv ‚thər·mō·dī′nam·iks]
(thermodynamics)
The law that heat is a form of energy, and the total amount of energy of all kinds in an isolated system is constant; it is an application of the principle of conservation of energy.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In this way, the combined availability losses through heat transfer and internal irreversibilities in Figure 12 may be used as a means to derive and decompose efficiency information from the in-cylinder temperature profile, over and above the 1st Law analysis.
Overall, the 2nd Law model provides measures of engine efficiency beyond what is seen within the 1st Law analysis.
The [N.sub.2]O concentrations above the soil surface and in the soil atmosphere were linearly interpolated to estimate [N.sub.2]O fluxes ([N.sub.2]O_[flux.sub.gradient]) using Fick's 1st Law (Campbell 1985):
Gas diffusion rate is proportional to the concentration gradient according to Fick's 1st Law (Eqn 1) (Glinski and Stepniewski 1985; Ghildyal and Tripathi 1987).