endothermic
The production of ammonia is an exothermic reaction.
The breaking of bonds is an endothermic process requiring energy, while the making of bonds is an exothermic process with energy being released.
The reaction on the surface is exothermic, so the gases heat up.
A nuclear power plant is exothermic. It generates tons of heat into the biosphere that never would have been there otherwise.

SMART Vocabulary: related words and phrases

Physical & chemical processes
absorbable
absorptive
absorptive capacity
absorptivity
acidification
endothermic reaction
excitability
excitation
excite
exergonic
exothermic reaction
fermentation
impregnate
reabsorb
react
reboil
recondense
redox
scald
vaporize

You can also find related words, phrases, and synonyms in the topics:

Chemistry - general words

exothermic | American Dictionary

exothermic
adjective
[ not gradable ] chemistryus/ˌek·soʊˈθɜr·mɪk/
describes a chemical reaction that produces heat
earth scienceus/ˌek·soʊˈθɜr·mɪk/
involving the release or loss of heat:
magnesium starts an exothermic reaction in water.

exothermically

adverb[ not gradable ]us/ˌek·soʊˈθɜr·mɪk·li/

Examples of exothermic

exothermic
The analysis of the inner reaction-diffusion layer yields the heat flux produced by the exothermic reaction.
I n (3.7b) expressing the kinetic law governing the heat flux released by the exothermic reaction, we have only retained the flame temperature modification (#, $; 1).
This is because these eight reactions are exothermic whereas the others are endothermic.
The reason for the low barrier is that the reaction is quite exothermic at 20 kcal molx1.
Fusion reactions are studied worldwide on a large scale since about 1942 for exothermic reactions.
To be feasible this transfer must be close to thermoneutral (or exothermic), since the actual methane formation cannot start out at a too high energy.
After this, the resulting hydroxyl radical is immediately quenched in a strongly exothermic step.
This local maximum exists because the pressure behind the shock decreases as a result of the exothermic reaction and/or geometric expansion.
The reactions have no entrance barriers and are all exothermic.
Neuronal responses are typically slow in cold conditions with consequences for the survival of exothermic organisms.
In the case of propagating reaction fronts the exothermic chemical reaction plays the role of heating from below.
If we consider for example an upward propagating exothermic chemical reaction, then the temperature of the medium below the reaction zone is greater than the temperature above it.
Clearly, for both primed and control seeds, reactions were still occurring and resulting in an overall exothermic heat flow after seeds had lost the ability to germinate.
All reactions were found to proceed without an entrance barrier, to have exit barriers well below the energy of the reactant molecules and to be strongly exothermic.
The cause was found to be the result of an organometallic blue pigment which caused an exothermic catalytic reaction with another additive in the foam.
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