THOMSEN, JULIUS.

Thermochemiske Undersøgelser over Affinitetsforholdene imellem Syrer og Baser i vandig Opløsning. I-XII (in 7 Parts, all).

Kjøbenhavn, 1869-73. 4to. Bound i one cont. hcalf. Back a little rubbed. Around 300 pp. and 3 folded plates. Together with the authors: Bidrag til et thermochemisk System. Kbhvn., (1852). 4to. (48) pp. All issued in Videnskabernes Selskabs Skrifter.

First edition of Thomsens main contributions in thermochemistry, undoubtly the most importent contribution from a Dane in chemistry in the 19th century. - The paper from 1852 "Contribution to a Thermochemical System" is famous as it is the first statement of a new nomenclatura and the paper contains the first enunciation of the thermochemical affinity principle, which states that chemical affinity, or the attraction between substances, can be measured by the heat evolved when body combine. His fundamental thought was that the evolution of heat accompanying a chemical reaction (which he called varmetoning, equivalent to enthalpy change) is an exact expression of the chemical affinity of the reaction.

Order-nr.: 25824