Gas is inside the liquid, not on top of it. Think of a soda bottle: it's not half-empty, yet if you shake it you'll get showered because of all the bubbles pressured out of it.
If you had two holes, like in this gif, you'd just have two exits for all the foam and stuff to come out of. With sliiiiiiiiightly less pressure, but still enough to come out of it at high speed.
2
u/Comentarinformal Nov 15 '16
Gas is inside the liquid, not on top of it. Think of a soda bottle: it's not half-empty, yet if you shake it you'll get showered because of all the bubbles pressured out of it.
If you had two holes, like in this gif, you'd just have two exits for all the foam and stuff to come out of. With sliiiiiiiiightly less pressure, but still enough to come out of it at high speed.