Good morning. I have a question about gas flow.
Assuming that there are two different systems 1 and 2, system 1 and 2 interact through a small hole. If system 2 pressure is higher, we ask if there is a hydrodynamic formula or other scientific formula that explains how the gas flow is in the hole.
[For example, the flow of gas when a small hole is formed in a sealed bag containing air]
※ The gas in system 1 and 2 is air.