Can the ignition temperature of a substance be changed?......If it can be changed the how?
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As the supply of oxygen decreases the substance does not get the required energy to undergo combustion. It is same as the activity of paper cup where the cup having water doesn't burn easily because the ignition temperature has not met. So here also if the pressure of the oxygen concentration decreases its ignition temperature will increase.
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For first question Coal is answer, second one is hydrogen, third one is biogas, and in general, the Self Ignition auto ignition temperature is lowest temperature at which a fuel like petrol or diesel spontaneously ignites in normal atmosphere without an external source of ignition.
The ignition temperature of a substance is the least temperature at which the substance starts combustion. Substances which spontaneously ignite in a normal atmosphere at naturally ambient temperatures are termed pyrophoric.
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