FDNY Certificate of Fitness G60 Practice Exam 2026 - Complete Prep Guide

Gasoline is classified as a flammable material because it has a low flash point, meaning it can easily ignite at relatively low temperatures. This characteristic makes it highly dangerous in environments where heat sources or sparks are present. In contrast, water is not flammable; instead, it is often used to extinguish fires. Sand and concrete also do not support combustion and are considered non-flammable materials, as they do not ignite or change chemically when exposed to fire. Understanding the properties of these materials, particularly their ignition and combustion characteristics, is crucial for fire safety and prevention protocols.