完かん全ぜん真しん空くう

noun

perfect vacuum

Technical term in physics and engineering for a space entirely devoid of matter, or an ideal state with zero pressure.

• 完かん全ぜん真しん空くうを作つくり出だすことは技ぎ術じゅつ的てきに非ひ常じょうに難むずかしい。

  Creating a perfect vacuum is technically extremely difficult.

• 理り論ろん上じょう、完かん全ぜん真しん空くうでは音おとは伝つたわらない。

  In theory, sound does not travel in a perfect vacuum.