The density of the gases are low enough to allow convective currents to develop.

气体的密度低到足以形成对流。

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Atom loss from the trap and total collision cross section can be inferred from the knowledge of the density of background gases.

在获知背景气体密度的条件下，可以计算出原子损耗和完全碰撞截面。

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Among the storage technologies of automotive fuel gases (hydrogen and nature gas), adsorption storage is a promising technology for the low density and fast desorption of adsorption storage materials.

在以氢和天然气为主的车用燃气的存储技术中，吸附存储材料以其密度小、吸脱气体速度快等优点使吸附存储成为一类极具发展潜力的存储技术。

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