What is a gas?

What is a gas?

• A. Any material that has a boiling point greater than 212 degrees F
• B. Any material that has a boiling point of less than 68 degrees F
• C. Any material with an unknown boiling point
• D. Any material that is not flammable

Answer: (B)

Gas means a substance that is in the gaseous state under typical room conditions. In hazmat practice, that happens when the normal boiling point of the material is at or below room temperature (about 68°F). If a substance boils below 68°F, it will exist as a gas at room temperature and pressure, which is why a boiling point less than 68°F identifies a gas. Think of it this way: a substance with a boiling point above room temperature would be a liquid (or solid) at room temperature, not a gas. The statement about a boiling point being less than room temperature correctly captures the behavior of gases in everyday conditions. An unknown boiling point doesn’t tell you its state at room temperature, and flammability doesn't determine whether something is a gas.

Gas means a substance that is in the gaseous state under typical room conditions. In hazmat practice, that happens when the normal boiling point of the material is at or below room temperature (about 68°F). If a substance boils below 68°F, it will exist as a gas at room temperature and pressure, which is why a boiling point less than 68°F identifies a gas.

Think of it this way: a substance with a boiling point above room temperature would be a liquid (or solid) at room temperature, not a gas. The statement about a boiling point being less than room temperature correctly captures the behavior of gases in everyday conditions. An unknown boiling point doesn’t tell you its state at room temperature, and flammability doesn't determine whether something is a gas.