Ha, I just found out my tank glows in the dark.
And earlier today I emptied the tank to put a new gauge on it as the other was leaking. I was surprised by how long it took to empty, over an hour, the pressure gauge was reading zero for at least half an hour while air continued to hiss out. but it was fun to see this bit of physics at work:
And earlier today I emptied the tank to put a new gauge on it as the other was leaking. I was surprised by how long it took to empty, over an hour, the pressure gauge was reading zero for at least half an hour while air continued to hiss out. but it was fun to see this bit of physics at work: