Auto-ignition temperature is____________________?

A. indicated by 50% distillation temperature

B. temperature at which it solidifies or congeals

C. that at which it catches fire without external aid

D. indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off

E. minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

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