When a gas or vapour condenses, or is condensed, it changes into a liquid. Water vapour condenses to form clouds The compressed gas is cooled and condenses into a liquid
compress or concentrate; "Congress condensed the three-year plan into a six-month plan"
If you condense something, especially a piece of writing or speech, you make it shorter, usually by including only the most important parts. We have learnt how to condense serious messages into short, self-contained sentences