Regarding the concept of vacuum level
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What is the relationship between vacuum level and gauge pressure? For example, what is the vacuum level at -0.03 MPa? Or, what is the gauge pressure at a vacuum level of 0.03 MPa?
Gauge pressure = Absolute pressure – Atmospheric pressure. Vacuum level = Atmospheric pressure – Absolute pressure. Gauge pressure = Vacuum level × (-1). For example, when it is -0.03 MPa, the vacuum level is 0.03 MPa
I’m still not quite sure: absolute vacuum is -0.1 MPa, so what does a vacuum level of 5 Pa mean?
With a vacuum level of 5 Pa, the absolute pressure is 0.099995 MPa, which constitutes a low vacuum level; the highest possible vacuum level is 0.1 MPa. What is referred to as a complete vacuum is one in which there is no air present
By normal pressure, we mean an atmospheric pressure of 0.1 MPA in absolute terms, with a gauge pressure of 0. Vacuum degree refers to the part that is below normal pressure. The vacuum level is 0.03 MPa, the gauge pressure is -0.03 MPa, and the absolute pressure is 0.07 MPa.
If you don’t even know this, you’d better not work in the chemical industry
An absolute vacuum cannot be achieved; a vacuum level of 0.1 MPa in terms of gauge pressure is equivalent to 0 Pa. The original poster is probably referring to a gauge pressure of 5 Pa