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I need to find the speed of air directly coming out of a nozzle connected to a compressed air tank. Inside the tank I have 30 psi gauge pressure (~207 kPa) and the diameter of the nozzle is 1.5 mm. Atmospheric pressure outside.

Isn't there a simple formula for this...? I've been searching for quite a while now, I haven't come across anything somewhat straight-forward. I need to ask real people.

I appreciate it, will give thanks!