Question

louest ignition temperature has ?​

Answer 1

Answer:

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.

Answer 2

Answer:

before a substance catches fire and starts burn it must be heated to a certain minimum temperature by supplying heat. the lowest temperature at which the substance catches fire and starts burning is called its ignition temperature. A combustible substance cannot catch fire if its temperature is lower than its ignition temperature