‎"GAY-LUSSAC, (JOSEPH). - THE ""GAY-LUSSAC LAW"" OF EXPANDING GASES ANNOUNCED - GERMAN VERSION.‎
‎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.‎

Reference : 44130

‎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.‎