The value of the critical density is very small: it corresponds to roughly 6 hydrogen atoms per cubic meter, an astonishingly good vacuum by terrestrial standards!
临界密度的值非常小：它相当于每立方米约6个氢原子，从地球上的标准来看这简直是真空！
This paper presents the characteristics of silicon micromachining resonance vacuum sensor and a vacuum meter utilizing this sensor.
文中介绍硅微机械谐振真空传感器的特点及配套研制的真空计。
On the working spot of centrifugal water pump, the detection can be carried out only by fixing the negative pressure translator in the original position of vacuum meter.
在离心式水泵工作现场只须把原安装真空表的位置换上负压变送器即可进行检测。
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