What is volatility?

• A. The tendency to vaporize or give off fumes.
• B. The color of a material when exposed to light.
• C. The rate at which it reacts with acids.
• D. The ability to conduct electricity.

Answer: (A)

Volatility is the tendency of a material to vaporize and form vapors. In hazmat work, this means how readily a liquid will give off vapors at the surrounding temperature, which is tied to its vapor pressure. The higher the vapor pressure, the more quickly the substance becomes a vapor that can mix with air, travel, and potentially ignite or be inhaled. That’s why highly volatile substances pose immediate air dispersion and flammability risks, even without added heat. It’s not about color changes, how fast it reacts with acids, or whether it conducts electricity; those properties describe different behaviors, not volatility.