Britannica Sources used in this answer

At what temperature does chlorine become a liquid?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

A labeled diagram of the chlorine element from the periodic table shows its atomic number 17, symbol Cl, electron configuration, and atomic weight range. The box is shaded green to indicate chlorine is a halogen, with icons for orthorhombic crystal structure, gas state at room temperature, and strong acidity. A key explains the icons and colors used. — chlorine Properties of chlorine.

Chlorine becomes a liquid at −34 °C (−29 °F) at atmospheric pressure.12

While it exists as a greenish-yellow gas at room temperature, it can be easily liquefied by cooling it to this boiling point or by applying pressure at ordinary temperatures.2