What term describes the temperature at which a substance boils?

What term describes the temperature at which a substance boils?

• A. Melting point
• B. Freezing point
• C. Boiling point
• D. Critical temperature

Answer: (C)

The term that describes the temperature at which a substance boils is known as the boiling point. This is the specific temperature where a liquid transforms into vapor or gas as it gains sufficient energy to overcome the intermolecular forces holding it in the liquid state. The boiling point can vary depending on the atmospheric pressure; for example, water boils at 100 degrees Celsius at sea level, but this temperature is lower at higher altitudes due to reduced atmospheric pressure.

In contrast, the melting point refers to the temperature at which a solid becomes a liquid, while the freezing point is the temperature at which a liquid becomes a solid, both of which are distinct from boiling point. Critical temperature denotes the highest temperature at which a substance can exist as a liquid, regardless of pressure. Therefore, boiling point is the accurate term when discussing the temperature at which substances transition from a liquid to a gaseous state.