Liquids that can burn are called flammable and combustible. The critical contrast between the two is that flammable liquid can catch on fire and burn quickly at average room temperature while combustible liquids require more to ignite.
Combustible refers to the potential to explode. If a substance has low combustibility, it is difficult to start a fire. However, if a material is more combustible, then safety measures need to be taken. This situation is when you are dealing with kerosene, diesel, natural gas, butane, propane methane, and even vegetable oils. These are a few examples of flammable liquids. When a subject is flammable, it is a determination of how fast does the object ignites? Some combustible substances include dust, fibers, mists, or vapors produced by the substance, such as plastics and dry gases.