boiling point

In a scientific context, this term refers to a precise physical constant. It is used objectively to describe the phase transition of a substance from liquid to gas, typically associated with heat and pressure.

When used figuratively, the term describes a state of extreme emotional or social tension. It suggests a threshold that, once crossed, results in an inevitable and often violent explosion of activity or anger. In this sense, it is frequently used without an article (e.g., "reached boiling point") to emphasize the state of the situation rather than a specific point in time.