Liquid fuels are those combustible or energy-generating molecules that can be harnessed to create mechanical energy, usually producing kinetic energy; they also must take the shape of their container. Most liquid fuels, in widespread use, are or derived from fossil fuels; however, there are several types, such as hydrogen fuel (for automotive uses), which are also categorized as a liquid fuel. It is the fumes of Liquid fuels that are flammable instead of the fluid.
This article deals primarily with the concept of liquid fuels in relation to ground transport. However, others such as rocket fuel also play an important role in the economy.
Read more about Liquid Fuels: Petroleum, Non-petroleum Fossil Fuels, Biodiesel, Alcohols, Hydrogen, Ammonia, Properties of Liquid Fuels
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—John Milton (1608–1674)