Water Pressure?

Question

How much pressure is there at the bottom of 220 m of water, not counting atmospheric pressure? I know that it's density x acceleration x height, so is the answer 2156000 pascals? Is the unit correct?

Answer 1

The weight on 1 square metre of water is...

220 x 9.81 x 1025

that is...

220 m, 9.81 N/kg and 1000 kg/m3

which is 2158200 N/m2 (If you cancel out the units above)

or 2158200 Pascals

This is reasonably close to your result, depending only on the precision of the values used in the calculations.

Measure pressure directly in the air with a barometer:

http://www.stuffintheair.com/barometric-pressure-definition.html

Good luck.

Answer 2

Your problem is that the bladder tank has ruptured. The bladder tank is that big blue (usually) thing near where the water line enters the home. With the tank to regulate pressure, the well pump is cycling on and off as water is being used, resulting in the pressure being high when the pump in on and near the shutoff pressure for the pressure switch, and down to nothing once it shuts off until the pressure drops to the level where the switch calls for more water. Replace the bladder and then use an air compressor to pressurize the bladder to 35-40 lbs.

Answer 3

Using Google 2156000 pascals converts to about 312 pounds/in^2 which is approximately correct, so I think your units are fine.

Answer 4

220 x 1000 x 9.8 = 21,56,000 pascals and is correct.