how deep is 20 bar ,in water?

Answer 1

Looks like the first answerer has no idea of what you're asking.
I'll walk you through the math.
1 atmosphere is equal to 1.01325 bars
You get a 1 atm change for every 33 feet in depth. We also have to take into account 1 atm already present at the surface.
So:
Lets convert the bars to atm's
20 divided by 1.01325 = 19. 738465 and change.
That gives you your number of atmospheres equivalent to 20 bars.
Subtract 1 atm for surface air pressure. This leaves you with 18.738465 atmosphere's to find the depth.
We know that 1 atm is approx 33 feet in a column of water so
18.738465 X 33 = 618.369345 feet
There you go. To get a 20 Bar pressure, you need to be at 618 feet. approximately. Pretty dark down there.

Edit to muddiver.

Appendix C of the USN divers manual contains phone numbers for NOAA and the experimental diving unit, nothing but phone numbers. :)
What you are referring to is in chapter 2 2-12 table 2-10 and the numbers actually are 33.9139 FW and 33.066 FSW to a bar in there. I used the standard recreational scuba numbers in my calculations above as they're used more widely and 33 (the accepted standard) is an easier number for everyone to remember and rounded the numbers for the same reason. Also, you forgot to include surface air pressure in your result. That induced an error of an extra atm or 33 feet deeper than the actual result really is. Fine for ultra conservative deco schedules but not the answer he was going for.
I own the book by the way. :)

Answer 2

20 Bar Depth

Answer 3

This sound like a watch rating. The rating on the watches are for static pressure. Meaning that the watch is not moving in the water. The movement of the watch in the water, or dynamic pressure, can create three times the pressure. The watch should be rated for 3x the planned diving depth. 20 bar watch would be good to approximately 65 m or 200 ft. More than plenty for a recreational diver.

Answer 4

P = density x gravitational field strength x height

P, pressure -> convert Bar to pascals, 1bar = 1x10^5 Pa so 20 Bar = 20x10^5Pa

Remeber that the 20 bar includes 1.013 bar atm air on the surface.

so subtract this from 20 which gives 18.897 bar. This will give thedepth considering air pressure

Density of water = 1000 kg m^-3

Gravitational acceration = 9.81ms^-2

Height = ?

H = P/(density x grav acceration)
=18.897x10^5/(9.81x1000)
= 192 meters

Exclusive of air pressure,
H = P/(density x grav acceration)
=20x10^5/(9.81x1000)
= 204 meters

There s your answer(s)

Answer 5

I had to learn this years ago when getting certified but long since forgot the math. I'm only here because I'm interested in a watch water resistant to 20 BAR and was making sure I'd never be that deep. I won't. Thanks.

Answer 6

A Bar is a measure of pressure. And is equal to 33.4704 feet in depth of fresh water.

Therefore 20 Bar is equal to 669.408 feet depth of fresh water.

Also 20 Bar is 652.672 feet of sea water.

Answer 7

At about 34 feet under water the pressure is one bar so 20 bar would be 20x34 or 680 feet.

Answer 8

Maybe this will help..
http://www.abe.msstate.edu/Tools/csd/NRCS-BMPs/pdf/water/erosion/waterbar.pdf

and:

Definitions of Water bar on the Web:

* a ditch or hump constructed diagonally across trails or roads to reduce soil erosion by diverting surface water runoff into adjacent ditches or vegetation. http://www.sfrc.ufl.edu/Extension/ssfor11.htm

* A shallow trench or diversion dam which diverts roadside ditch and surface water runoff from roads (inactive or closed), firebreaks, or skid trails (active or inactive) into a dispersion area. Water bars are used to minimize erosion and provide conditions for natural or artificial revegetation.
http://www.dnr.wi.gov/org/land/forestry/Usesof/bmp/bmpGlossary.htm

* A diversion ditch and/or hump installed across a trail or road to divert runoff from the surface before the flow gains enough volume and velocity to cause soil movement and erosion, and deposit the runoff into a dispersion area. Water bars are most frequently used on retired roads, trails, and landings.
http://www.epa.gov/OWOW/NPS/MMGI/Chapter3/ch3-3.html

* A continuous strip of waterproof material placed at concrete joints designed to control cracking and limit moisture penetration.
http://www.hydro.mb.ca/our_facilities/build_gen_station/glossary.html

* A diversion ditch or hump in a trail or road for the purpose of diverting surface water runoff into roadside vegetation, duff, ditch or dispersion area to minimize soil movement and erosion.
http://www.calforests.org/glossary.html

* A mound or ridge of soil formed across a road or trail for the purpose of deflecting water onto the adjacent area, usually into the forest litter.
http://www.state.sc.us/forest/rbg.htm

* A shallow trench cut into the surface of road, or created by an embankment (eg, log and soil), to collect and channel water off the surface, to avoid erosion.
http://www.woodlot.bc.ca/swp/myw/html/21_Glossary.htm

* A small metal bar rising above the level of threshold to a door to prevent water blowing below it.
http://www.homesurveyor.net/Glossary/glossary.html

* A drainage structure composed of an out sloped segment of tread leading to a rock or log barrier embedded at an angle across the trail. Water across the slope will be diverted by the out slope or by the barrier.
http://www.trailstobuild.com/Articles/trail_maintenance_glossary.htm