Overview
Français
Read this article from a comprehensive knowledge base, updated and supplemented with articles reviewed by scientific committees.
Read the articleAUTHORS
-
Stéphane VEESLER: Doctor of Materials Science Research Fellow at the Centre de recherche sur les mécanismes de la croissance cristalline (CRCM2) - Laboratory associated with the universities of Aix-Marseille II and III CNRS, Luminy campus, Marseille
-
Bernard LEFRANÇOIS: Professor at the Conservatoire national des arts et métiers
INTRODUCTION
During an isothermal reaction or transformation taking place at constant pressure, the amount of heat received, or supplied, by the system is equal to its enthalpy variation.
If the reaction is endothermic, energy must be supplied to the system and the enthalpy change, ΔH, is positive.
If the reaction is exothermic, it develops by releasing heat, and the enthalpy variation, ΔH, is negative.
The Ultimate Scientific and Technical Reference
This article is included in
Characterization and properties of matter
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Water dissolution enthalpies of mineral compounds
Dissolution reaction
