system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do firehoses flail around with such immense force if nothing/nobody is holding them steady? Is it the water itself “pushing” on the spout of the hose as it comes out?

For clarification I know that fire hydrants release water with insane pressure, I’m just wondering what exactly about that water pressure causes the hose itself to become a wacky-waving-inflatable-arm-flailing-tube-man. Thanks!
gpt
Yes, the water coming out of the hose works exactly like the thrust from a jet engine. It creates a force on the hose, trying to push it in the opposite direction of the water flow. This causes the hose to move, which changes the direction the water is shooting from second to second, changing the direction that the hose is getting pushed, ending up with a bunch of random flailings.