Fuel
Definition 1 of 3
Pro Tip 1/3
Types of Fuel
Fuels vary from liquids to gases and solids. Know the right type for the context. Wood is a solid fuel used in campfires.
Pro Tip 2/3
Fuel Usage
Talk about fuel in context of machines, heaters, engines, not living things. The truck's engine requires diesel fuel.
Pro Tip 3/3
Measurement Units
Use liters or gallons to measure liquid fuel; context depends on the country. I need ten gallons of fuel for my boat.