California ICC UST Service Technician Practice Exam 2026 – All-in-One Guide to Ensure Exam Success!

Gasoline vapors are indeed heavier than air. When gasoline evaporates, the vapor it produces is denser than the surrounding atmosphere, which causes it to settle close to the ground. This characteristic poses safety risks in confined spaces or low areas since these vapors can accumulate and create flammable conditions.

Understanding this behavior is critical for those working in environments where gasoline is handled or stored, as it affects ventilation needs, safety measures, and emergency response protocols. Recognizing that gasoline vapors do not dissipate quickly into the air informs proper safety assessments and procedures in both residential and commercial settings.