supercritical
adjective chemistry, physics specialized uk/ˌsuː.pəˈkrɪt.ɪ.kəl/ us/ˌsuː.pɚˈkrɪt̬.ɪ.kəl/
超临界的
relating to substances that are heated to higher than their critical temperature and pressure (= the highest temperature and pressure at which a gas can be changed into a liquid), resulting in changes to the way they behave
Although much denser than a gas, the supercritical CO2 is less dense than water so it will start to migrate upwards. 虽然比气体密度大得多，但超临界二氧化碳的密度比水小，因此它会开始向上移动。
- More examples
- Many common chemicals can go supercritical, for instance water, carbon dioxide and ethylene, used to make polythene shopping bags.
- Carbon dioxide, when it goes supercritical at just over 30C, was first used in the 1960s for extracting the caffeine from coffee beans without leaving a chemical residue.
- a new generation of supercritical coal-fired power stations
- They squeezed the gas to almost 100 times atmospheric pressure but heated it to just 35C. Once in the supercritical state, the ketones were added.