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The volatility of a liquid or liquefied gas may be defined as its tendency to vaporize, that is, to change from the liquid to the vapor or gaseous state. Because one of the three essentials for combustion in a flame is that the fuel must be in the gaseous state, volatility is a primary characteristic of liquid fuels. Thus their vaporizing tendencies are the basis for the general characterization of liquid petroleum fuels as liquefied petroleum gas, natural gasoline, motor and aviation gasolines, naphthas, kerosine, gas oils, diesel fuels, and fuel oils.