Water pressure builds as you dive, would a "steel umbrella" change the water pressure on ones body below?

Question

Is there a hand held device that can indicate the water pressure at various depths? Thank you

Answer 1

Steel Umbrella=submarine (pressurized) so the body is not affected by the real outside pressure. So, in a submarine you would be fine to the crush depth of the submarine

Steel Umbrella=open cup at bottom (non-pressurized) would allow pressure below to compress the available air in the cup==yes a body in that cup would be affected. Interesting though, the cup would have NO crush depth since the cup would always be at the same pressure and could withstand a trip to the deepest part of any ocean (even inverted downward trapping air). "You" however could not survive the trip alive below a certain depth. And if you came up it would be worse, you would almost certainly get "the bends".

1 atmosphere every 33 feet--at sea level you are at 1 atmosphere. At 33 feet deep you are at two atmospheres...etc.

Yes--there is a commonly used pressure device called a Submersible Pressure Gage--a standard and required device attached to every Scuba regulator (go have someone show you). Except, it reads out as depth as feet (meters in all the rest of the world). Depth and time is VERY important for us Scuba divers.

Finally--If you want the "true" pressure in inches of mercury or BARS, you can make a hand held "Taylor" barometer water tight by enclosing it in a TRUE waterproof case with a clear plastic cover--that would get what you want. Find Taylor instruments DOT com--and look for Pressure barometers.

I hope this clears this up for you!

Weatherman, and Scuba diver

Answer 2

Pressure inside a fluid at a particular depth is equal at all points in that level. Also the pressure is acting from every point on a body at that level. Even if you are in a submarine and there is a hole in that the pressure in side the vessel will eventually reaches the pressure out side (The hole size determines the resistance for pressure build up, less size more resistance).
Its a misconception that pressure is acting from top, no its acting from everywhere. In a submarine the wall of the submarine is resisting the crushing force of water. The tougher the shield the deeper it can go.
You just remember the principal of hydrolic lift. In that the pressure is transmitted from one point of the fluid to another point without any loss.

Answer 3

Scottydog,
Check this business out. I don't know about something that can measure this but it very well could be out on the market.

When your at sea level, your body is at 1 atm (1 atmosphere). For every 33ft you go underwater, that's another atmosphere (so at 33 feet, your at 2 atm, 66 feet your at 3 atm). You can figure out how much pressure is being applied to your body in pounds per square inch because 1 atm equals 14.7 lbs psi.

So, to measure what the water pressure is at various depths, use the rule of 33/1 and go by your depth-o-meter! Hope that helps boss, take it easy out there!

Answer 4

If it is true we would all be exploded if we take shelter.