Internal Combustion Engines
Volatility of diesel fuel oil is

It catches fire without external aid
Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
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
Temperature at which it solidifies or congeals

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Internal Combustion Engines
The expansion of fuel in a four stroke cycle diesel engine

Starts at 15° after top dead center and ends at 30° before bottom dead center
Starts at top dead center and ends at 30° after top dead center
May start and end anywhere
Starts at 15° before top dead center and ends at 30° after top dead center

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