Vacuum level and vacuum measurement
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Dear sea friends, does the vacuum level of 5E-5pa mean -0.00005pa? If so, may I ask where does the zero point for -0.00005 come from? Atmospheric pressure? Absolute zero pressure? Is there any watch that can measure accurately?
Just remove the negative sign, and that’s it. As for how to accurately measure such a high level of vacuum, one can consult the relevant instrument manufacturers
5E-5pa = 0.00005pa represents absolute pressure; the minimum value is 0, which indicates a very high level of vacuum that typical pumps are unable to achieve. You have a misunderstanding of the concept of vacuum level; there is a diagram that illustrates the relationship between gauge pressure, absolute pressure, atmospheric pressure, and vacuum level – you’ll understand it if you search for it
There are some common vacuum pumps that can achieve a vacuum level of -0.1 MPa. Compared to 0.00005 Pa, which one has a higher vacuum level?
-0.1Mpa is a rough value that can be displayed by a pressure gauge; in reality, -0.1Mpa could equal 1 Pa, it could equal 0.1 Pa, or it might even equal 100 Pa. It’s similar to when using a scale used for weighing cars, which shows 0, while a precise electronic balance shows 0.01 g
The chart that Brother Qingcheng mentioned, I’ve been searching for it for a long time without success.