2012年1月21日星期六

What is Gauge Gressure ?


Pressure is represented by defining atmospheric pressure as zero. Pressure higher than atmospheric pressure is positive pressure, while pressure lower than atmospheric pressure is negative pressure.

Note: Atmospheric pressure varies depending on the weather, the altitude, etc. Therefore, a gauge pressure measuring instrument in which atmospheric pressure is defined as zero may not display the pressure value under absolute vacuum as “-760 mmHg”.




gauge type

没有评论:

发表评论