Endothermic




In Marcellin Berthelot.

The concept is frequently applied in physical sciences to e.g. chemical reactions, where chemical thermal energy (heat).

Overview

Endothermic, also known as endergonic, refers to a transformation in which a system receives heat from the surroundings:

Q > 0

When the transformation occurs at constant pressure:

∆H > 0

and constant volume:

∆U > 0

If the surroundings do not supply heat (e.g., when the system is adiabatic), an endothermic transformation leads to a decrease in the temperature of the system.[1]

Endothermic processes

Some examples of endothermic processes are:[2]

  • Melting of ice
  • Depressurising a pressure can

Implications for chemical reactions

Chemical endothermic reactions need heat to be performed. In a thermochemical reaction that is endothermic, the heat is placed on the reactants side (heat is necessary for and absorbed during the reaction).

Applications of endothermic processes

Endothermic materials in passive fire protection

Main article: Passive fire protection

Endothermic substances, both natural, e.g. steam.

See also

References

  1. ^ Perrot, Pierre (1998). A to Z of Thermodynamics. Oxford University Press. ISBN 0-19-856552-6. 
  2. ^ Exothermic - Endothermic examples
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Endothermic". A list of authors is available in Wikipedia.