What is the condition of a boiling liquid?

A boiling liquid exists when it is at its boiling point, where the temperature and pressure are such that the liquid and vapor phases coexist in equilibrium. In this state, the liquid is saturated, meaning it has absorbed enough heat to become vaporous while still retaining some liquid characteristics.

At the boiling point, any additional heat added to the liquid does not increase its temperature but instead is used for the phase change from liquid to vapor. This condition reflects the balance between the thermal energy of the liquid molecules and the pressure in the surrounding environment.

The other conditions described, such as superheated, subcooled, or compressed, represent different states of a fluid that do not accurately depict a boiling liquid. For example, superheated refers to a vapor that has been heated beyond its boiling point without an increase in pressure, while subcooled indicates a liquid is cooled below its saturation temperature at a given pressure. Compressed typically refers to a state where the fluid is under high pressure, resulting in a deviation from typical boiling conditions.