Which materials are considered flammable?

Flammable materials are defined as those that can ignite easily and burn rapidly, typically at relatively low temperatures. The key characteristic of flammable substances is their ability to ignite under normal conditions, often at or near room temperature. This includes a range of materials that can produce enough vapor or gas to catch fire easily when exposed to an ignition source.

Materials that ignite easily at room temperature encompass a variety of liquids, gases, and even some solids that can produce flammable vapors. Thus, proper handling and storage techniques must be employed to mitigate risks associated with flammable materials. It's crucial for workers to be aware of these characteristics to ensure safety in environments where such substances are present.

While certain other options touch on aspects of flammability, they do not encapsulate the broader definition as effectively. For example, materials requiring a spark to ignite may indeed be flammable, but not all flammable materials require a spark; some can ignite from heat or friction. Classifying all organic materials and solvents as flammable is also overly broad, as not all organic substances exhibit flammable properties. Finally, classifying materials solely as solid at room temperature doesn’t address their flammability, as many solids can also be classified as non-flammable.