Vacuum
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The atmospheric pressure commonly referred to, 0.1 MPa, refers to absolute pressure. I would like to ask what the minimum value of absolute pressure is 0? Could it be 0?
In an absolute vacuum, the minimum pressure is 0; it’s impossible for the pressure to go below 0. An absolute vacuum means nothing at all, and if the pressure were 0, black holes would arise
Learn about absolute vacuum – there is a limit to how low the vacuum level can go
?What do -70kpa/-90kpa mean in that enterprise? I have no idea what you’re talking about What do \"vacuuming\" and \"vacuum\" mean?
Gauge pressure is the actual air pressure; the theoretical minimum value is 0. A physical vacuum is actually a sea of energy that is in constant fluctuation. When the energy reaches its peak, it is converted into pairs of positive and negative fundamental particles; when the energy reaches its trough, those pairs of particles annihilate each other, converting back into energy.
What you’re referring to is gauge pressure; it uses 1 atmosphere as the zero point. A negative pressure area represents a vacuum. Go and learn the basic knowledge of vacuum technology on Baidu
There are absolute and non-absolute values. In terms of temperature, there are 0°C and 273K; it can be understood that 273K is defined as 0 degrees, just as 0.1 Mpa of absolute pressure is defined as 0 Mpa of gauge pressure. Absolute pressure of 0 and absolute temperature of 0 K represent the lower limits that physics has not yet been able to overcome. Things like black holes and dark matter are not something that chemistry needs to take into consideration