What is a characteristic property of propane at room temperature?

Propane is primarily found in a gaseous state at room temperature, which is typically around 20-25 degrees Celsius (68-77 degrees Fahrenheit). At these temperatures, propane is one of the lighter hydrocarbons and behaves as a gas. This is a fundamental characteristic that distinguishes it from other substances.

While propane can exist as a liquid under pressure and can be found in liquid form in gas containers, it generally vaporizes to a gas once the pressure is released in typical atmospheric conditions. This property is crucial in various applications, such as heating, cooking, and powering vehicles, where propane is utilized in its gaseous state.

The other options do not correctly describe propane's state at room temperature. It is not a solid, nor is it radioactive, which further confirms the unique properties of propane as a gas. Understanding these characteristics is important for safe handling and usage in retail and other applications involving LP gas.