Darwinism designates a distinctive form of evolutionary explanation for the history and diversity of life on earth. Its original formulation is provided in the first edition of On the Origin of Species in 1859.
The enthalpy - or internal energy - of a substance is a function of its temperature and pressure. The change in internal energy with respect to change in temperature at fixed pressure is the Specific Heat at constant pressure - cp.
Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic. Key Terms. endothermic: A description of a chemical reaction that absorbs heat energy from its surroundings. enthalpy: In thermodynamics, a measure of the heat content of a chemical or physical system.