
一般實驗物理研究基本知識技術課程 真空技術. 2010/07/19. OUTLINE. 名詞解釋 真空幫浦簡介 真空計簡介 超高真空系統操作實務. 名詞解釋. 真空:在一個空間內,如果其氣壓低於一大氣壓的氣體狀態,即稱為 真空。 平均自由徑 λ ( mean free path ): 氣體分子相繼兩次碰撞間所運動之距離的平均值。 氣流的種類與狀態:. 黏滯流: λ << d 氣體分子與氣體分子間碰撞頻繁,其次數遠大於氣體分子與管壁之碰撞次數。
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