Which term refers to liquids that can easily ignite?

The term that describes liquids that can easily ignite is "flammable." Flammable liquids are those that have a low flash point, meaning they can vaporize at room temperature to create ignitable vapors. When these vapors come into contact with an ignition source—such as a spark, flame, or hot surface—they can catch fire quickly and lead to combustion.

This characteristic of being easily ignitable is crucial for safety in handling, storing, and transporting such substances. In many contexts—such as in laboratories, industrial applications, and even everyday environments—understanding the flammability of materials is essential for assessing fire risks and implementing appropriate safety measures.

In contrast, other terms like "non-combustible" refer to materials that do not ignite or burn at all, and "involatile" generally pertains to substances that do not readily evaporate. "Combustible," while similar to flammable, typically includes materials that ignite at higher temperatures or under specific conditions, making it a broader category than flammable. Thus, "flammable" is the most precise term for liquids that can easily ignite.