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endothermic

 
Dictionary: en·do·ther·mic   (ĕn'dō-thûr'mĭk) pronunciation also en·do·ther·mal
(-məl)
adj.
  1. Chemistry. Characterized by or causing the absorption of heat; endoergic.
  2. Biology. Of or relating to an organism that generates heat to maintain its body temperature, typically above the temperature of its surroundings; warm-blooded.
endothermy en'do·ther'my n.

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Chemistry Dictionary: endothermic
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Denoting a chemical reaction that takes heat from its surroundings. Compare exothermic.



Architecture: endothermic
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Said of a reaction which occurs with the absorption of heat.


Wikipedia: Endothermic
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In thermodynamics, the word Endothermic "within-heating" describes a process or reaction that absorbs energy in the form of heat. Its etymology stems from the Greek prefix endo-, meaning “inside” and the Greek suffix –thermic, meaning “to heat”. The opposite of an endothermic process is an exothermic process, one that releases energy in the form of heat. The term “endothermic” was coined by Marcellin Berthelot.

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

Contents

Overview

Endothermic, also incorrectly known as endergonic, refers to a chemical reaction in which a system receives heat from the surroundings.

Q > 0

When this 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 increase in the temperature of the cycle.[1]

Endothermic processes

Some examples of endothermic processes are:[2]

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).

See also

References

  1. ^ Perrot, Pierre (1998). A to Z of Thermodynamics. Oxford University Press. ISBN 0-19-856552-6. 
  2. ^ Exothermic - Endothermic examples

External links


 
 
Learn More
exothermic
endoergic
differential scanning calorimeter (chemical engineering)

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Chemistry Dictionary. A Dictionary of Chemistry. Sixth Edition. Copyright © Market House Books Ltd, 2008. All rights reserved.  Read more
Architecture. McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Endothermic" Read more