ignition point

noun Chemistry.
Also called ignition temperature.


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American Heritage
Science Dictionary
ignition point   (ĭg-nĭsh'ən)  Pronunciation Key 
The minimum temperature at which a substance will continue to burn on its own without the application of additional external heat.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Eventually, the ranger investigators found the ignition point.
In addition, the risk of combustion is reduced due to the higher ignition point
  of natural gas compared to petroleum fuels.
On the treated carpeting, however, the flame's spread is restricted to less
  than one inch from the ignition point.
Large chunks of coke can contain pockets of unquenched material at temperatures
  well above the ignition point.
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