超ちょう高こう真しん空くう

noun

ultra-high vacuum; UHV; extremely high vacuum; XHV

Technical term in physics and engineering for a vacuum with pressure below about 10⁻⁷ Pa. XHV (extreme high vacuum) refers to even lower pressures.

• この実じっ験けんは超ちょう高こう真しん空くう環かん境きょうで行おこなわれる。