Negative pressure operation
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What is the maximum negative pressure that can be achieved? Is it -0.1 MPa?
It can only be approached infinitely closely, but not reached; to be precise, the gauge pressure is -0.101325 MPa, while the absolute pressure is 0.
Infinite approach to absolute pressure “0”"~~~~~~~~~~~~~~~~~~~~
Oh, it was always a bit unclear before; thanks for the explanation~~
Oh, I was misled by some information I saw online; now it’s been confirmed. Thank you···
It is infinitely close to theoretical vacuum, which is 0, but it can never be achieved
Negative pressure is measured with the ambient atmospheric pressure as the zero point, while absolute pressure is measured with theoretical vacuum as the zero point. Therefore, the level of negative pressure that can be achieved depends on the ambient atmospheric pressure in that location. In terms of pumps, in Shanghai it’s possible to achieve pressures below -103 kPa, but in Kunming, it might not even be possible to reach -90 kPa – the pressure would be very close to absolute vacuum