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‎Untersuchungen über die Ausdehnung der Gasarten und der Dämpfe durch die Wärme. (Vorgelesen im National-Institute am 11ten Pluv. J. 10"" 31sten Jan. 1801. Zusammengezogen aus den Annalen de Chimie t. 43, p. 137-175).‎

‎Halle, Rengerschen Buchhandlung, 1803. Without wrappers as extracted from ""Annalen der Physik. Herausgegeben von Ludwig Wilhelm Gilbert"", Bd. 12. Pp. 257-291 a. 1 folded engraved plate showing the experimental apparatus used.‎

‎First appearance in German of this extremely important paper in which Gay-Lussac first formulated the law, the Gay-Lussac's Law, stating that if the mass and pressure of a gas are held constant, then gas volume increases linearly as the temperature rises. This is sometimes written as V = k T, where k is a constant dependent on the type, mass, and pressure of the gas and T is temperature on an absolute scale. (In terms of the ideal gas law, k = n R / P.).""In 1802 he (Gay-Lussac) showed that different gases all expanded by equal amounts with rise in temperature. Charles had made the same discovery some years earlier but had not published it"" the credit therefore belongs to Gay-Lussac at least as much, and probably more. This was an extremely importent discovery, which Avogadro was to use within the decade to formulate hid long-neglected hypothesis that equal volumes of different gases at equal temperatures contained equal numbers of particles.""(Asimov).Magie ""A Source Book in Physics"", p.165-172 - Leicester & Klickstein ""A Source Book of Chemistry"", p. 374-379. - Parkinson ""Breakthroughs"" 1802 C.‎