Internal Combustion Engines
Volatility of diesel fuel oil is

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

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Internal Combustion Engines
Scavenging air in diesel engine means

Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Forced air for cooling cylinder
Burnt air containing products of combustion
Air used for combustion sent under pressure

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