Power of Water Pressure | I Didn't Know That

now just when you thought it was safe to return to the water here's Richard and Johnny and they're about to find out what it's like to be under an awful lot of pressure tipping water over someone's head might give them a bit of a shock if they're not expecting it but it's not gonna move them deliver a little more water with a little more force though and you can be pretty sure they'll notice but if you put a lot of water under a lot of pressure it could be very very powerful indeed and we're gonna show you with the help of these guys from the Hampshire Fire & Rescue Service two hoses and this car you ready guys the engine and brakes are off no boys forward up and the gear is in neutral the water is blasting out at a pressure of 12 bar that's 12 times atmospheric pressure and the molecules of water are traveling at such velocity they create enough force to move the car well they're off putting out fires it gives us a chance to explain another use of water under pressure to clean it's used by councils to remove fat from the walls of sewers in central London most of this comes from hundreds of fast-food outlets it gets flushed down sinks and washed it down drains but because fats doesn't mix with water as the water drains away this stuff builds up on the walls eventually causing huge blockages one of the best ways to get rid of it is using high-powered water jets but high-pressure water doesn't just stop it's cleaning stuff concentrate your nozzle and create enough pressure and you can even use water to cut through steel that's also required and the speed is coming out with a thousand litres possession that's about the speed of applying foolish so if you could freak that machine up with a bit of the poor people you can throw some horrid it from Vince's Wow

Channel: National Geographic

Views: 302,293

Rating: 4.8250451 out of 5

Keywords: National Geographic, I Didn't Know That, strange, odd, fact, little-known, water pressure, blasted, force, physics, national geographic, nat geo, natgeo, animals, wildlife, science, explore, discover, survival, nature, documentary

Id: ZPXVARUt47g

Length: 2min 41sec (161 seconds)

Published: Tue Apr 17 2012