What value does the pressure gauge on the open-container tank show?
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There is a container whose vent valve is open; in other words, it is not sealed. So what is its pressure? What does the pressure gauge on the tank show?
The original poster wasn’t very specific – whether the pressure gauge is located on the top or bottom of the tank. If it’s on the top, there should be no reading; if it’s on the bottom, then it shows the static pressure generated by the medium inside the tank
The filling pressure is the local atmospheric pressure, and the filling pressure gauge reads zero
It depends on what substance you are storing and whether there is gas sealed in; under normal circumstances, it is at a slight positive pressure, of a few Pa
The top of the tank is 0, while the bottom is used to indicate the liquid level
Volatile liquids should be at a slight positive pressure; if the accuracy of the pressure gauge used is insufficient, it should read zero.