Sulfur is an example of what kind of hazardous material?

• A. Liquid
• B. Gas
• C. Solid
• D. Aerosol

Answer: (C)

The main idea here is understanding the usual physical state of a substance under normal conditions. Sulfur is a solid at room temperature and standard atmospheric pressure, so in hazardous materials classifications it is treated as a solid. It only becomes a liquid if you heat it above its melting point, and a gas only at much higher temperatures. Aerosol refers to tiny particles dispersed in air, which describes a form of the material in air rather than its standard state; sulfur as a solid is the general, everyday form used for classification and handling.