Which of the following is a characteristic of a gas hazardous material?

A characteristic of a gas hazardous material is that it has a boiling point less than 68 degrees Fahrenheit. Substances with a boiling point below this threshold are typically classified as gases at normal atmospheric pressure and temperature. This is important because gases behave differently than solids and liquids; they do not have a defined shape or volume and will expand to fill the container they are in.

In the context of hazardous materials, understanding the boiling point helps responders to identify potential hazards and manage containment and control measures effectively. Gases can pose various risks, including flammability, toxicity, and reactivity, making it essential for responders to recognize these properties during emergency situations.

The other choices reflect characteristics of different states of matter: defined shape and volume pertain to solids, while being solid at room temperature directly describes a physical characteristic of solids. Vapor that can condense into liquid is a property of substances that move between states but does not exclusively identify a gas as a hazardous material. Recognizing the distinction between gases and other types of materials is critical for hazardous materials management and response protocols.