Oxygen is available in plenty in air yet fuels do not burn by their own at room temperature. why???

hello, 

          it's very simple to say but it not possible as every substance and element need a particular ignation temp to work and exite to higher temp so oxgyen in air don't combust to fire in air.

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A particular activation energy is required for the combustion of the fuel which is not available at room temperature. Hence they do not burn at room temperatures. Although they burn when the temperature is raised.
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