The chemicals fired into the sky, usually dry ice or silver iodide, are supposed to provide a surface for water vapour to form liquid rain.
发射上天的化学物通常是干冰或碘化银,它们应该能为水蒸汽提供一个表面以凝结成雨滴。
They fill the container with pure air made by evaporating liquid nitrogen and liquid oxygen, and add water vapour and some trace gases.
他们将容器充满由蒸发液态氮和液态氧得到的纯空气,再加入水蒸气和一些痕量气体。
With compressed air temperature drop, the excess oil vapour condenses into liquid oil, to make the powder coating system problems.
随着压缩空气温度降低,多余的油蒸气将凝结成液体油,从而使粉末涂装系统出现问题。
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