The term combustible is often used to describe any material which will burn. However, this definition is rather vague, and is often tightened up by specifying more precisely the conditions under which burning may occur. For example, the widely-used OSHA definition is that a combustible liquid is one whose flash point is above 37.8 C (which might seem an odd figure to choose, but this is 100 F), but below 93.3 C (which is 200F). This allows a distinction to be made between combustible materials, which are fairly difficult to ignite, and flammable or highly flammable ones, which are far easier to ignite.
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