What is a liquid?

What is a liquid?

• A. Any material that has a boiling point less than 68 degrees F
• B. Any material that is a gas at room temperature
• C. Any material that has a boiling point greater than 68 degrees F
• D. Any material that is a solid at room temperature

Answer: (C)

Liquids are substances that, at room temperature and standard pressure, stay in the liquid phase because their boiling points are higher than that ambient temperature. If a material’s boiling point is greater than about 68°F, it does not boil away at room temperature and remains a liquid. This is why the statement about a boiling point greater than 68°F describes a liquid most accurately. In contrast, a boiling point below 68°F means the substance would boil at or near room temperature and would be a gas (not a liquid). A substance that is a gas at room temperature is, by definition, not a liquid. A solid at room temperature is, likewise, not a liquid. So the best descriptor for a liquid at typical room conditions is having a boiling point higher than room temperature.

Liquids are substances that, at room temperature and standard pressure, stay in the liquid phase because their boiling points are higher than that ambient temperature. If a material’s boiling point is greater than about 68°F, it does not boil away at room temperature and remains a liquid. This is why the statement about a boiling point greater than 68°F describes a liquid most accurately.

In contrast, a boiling point below 68°F means the substance would boil at or near room temperature and would be a gas (not a liquid). A substance that is a gas at room temperature is, by definition, not a liquid. A solid at room temperature is, likewise, not a liquid. So the best descriptor for a liquid at typical room conditions is having a boiling point higher than room temperature.