Which statement regarding fuel is true?

The statement that liquids must be vaporized before they can burn accurately reflects the combustion process. For a liquid fuel to ignite, it needs to be vaporized; this is because combustion requires the fuel to be in a gaseous state to mix with air (specifically oxygen) effectively. The vaporized fuel forms a mixture with air that is necessary for the chemical reaction of combustion to take place, producing heat and light.

In the context of different types of fuels, solids need to either be ground up or converted to gas to burn efficiently, while gases like natural gas or propane do not require vaporization. Thus, understanding the properties of fuels and their combustion leads to recognizing that the vaporization of liquids is a crucial step in the ignition process.

Vaporization enhances the surface area of the liquid fuel, allowing for a more efficient reaction with air, which is vital in various applications, including engines and heaters.