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不同真空度單位的換算
理想的真空是不存在的,我們所指的真空實際上只是低于一個標(biāo)準(zhǔn)大氣壓的氣體狀態(tài),即所謂稀薄的氣體。真空度就是用來度量氣體稀薄程度的一個標(biāo)準(zhǔn),它實際上指的是氣體壓強,壓強越低,真空度越高,反之越低。所以所謂真空都是指壓強比一個標(biāo)準(zhǔn)大氣壓小的氣體。 早期人們用毫米汞柱作為大氣壓的單位
保持真空泵真空度嚴(yán)密性的方法
水環(huán)式真空泵是用于抽吸系統(tǒng)中的氣體,然后排向周圍大氣以形成真空,或抽吸周圍的大氣排向系統(tǒng)之中以形成壓力的機械。
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