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How deep is 3 bars

by thenewage

How deep is 3 bars and could you use a watch that is limited to 3 bars for any serious diving?

ScubaDivingFanClub Answer:

The answer to your question is: 3bars = 20 meters or 66 feet. Now we will explain how we came up to this response.

A French philosopher and scientist named Blaise Pascal demonstrated that the pressure applied by the atmosphere at sea level is equal to the pressure applied by approximately 10 meters / 33 feet. It means that for each 10 meters / 33 feet of sea water, we will have to add 1 atmosphere.

When doing calculation on depth and the pressure we have to take into account that at the surface there is already one atmosphere. And also to get to the measuring system you feel comfortable with you have to know that 1 ATM=1.01 BAR and to make it more simple 1ATM=1BAR.

Depth

Pressure

0 1 ATM/BAR
10M/33F 2 ATM/BAR
20M/66F 3 ATM/BAR
30M/99F 4 ATM/BAR
40M/131F 5 ATM/BAR
50M/164F 6 ATM/BAR
60M/197F 7 ATM/BAR
70M/231F 8 ATM/BAR
80M/264F 9 ATM/BAR
90M/297F 10 ATM/BAR
100M/330F 11 ATM/BAR
150M/495F 16 ATM/BAR
200M/660F 21 ATM/BAR


Continuing with an answer to your question - to take a watch for recreational diving, these watches must be at least minimum 50M/164F or 6 ATM/BAR water resistant.

But I have a little story for you: I was doing a deep dive (30M/100F) with students doing PADI Advanced Open Water, and my diving watch had no battery. I needed a watch just to take the time of the dive and for the mandatory 3 minutes safety stop.

Going to work that day I decided to buy a cheap 100 meters digital watch just until I replace a battery in my diving watch.

Everything went well on the deep dive until we started the safety stop, I looked at that cheap peace of …100M watch and the crystal was gone, the watch filled up with water and I had to rely on one of my student’s watch for the safety stop and dive time.

Most watches have a 200 meters water resistance. I guess the following proverb applied to my purchase: "you get what you pay for".

Thank you for visiting our web site. We hope this answers your question and feel free to send any additional questions or concerns.

Have fun diving, Sincerely:
ScubaDivingFanClub
Where Scuba Divers share their passion.

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Some corrections have being made

We would like to thank our "Anonymous” visitor for his/her comment (see comment below). Yes there is some misunderstanding when we were trying to explain Blaise Pascal demonstration of pressure applied by the atmosphere. We will try to clarify and make it easier for our visitors to understand.

A French philosopher and scientist named Blaise Pascal demonstrated that the pressure applied by the atmosphere at sea level is equal to the pressure applied by approximately 10 meters / 33 feet. It means that 10 meters / 33 feet will be equal to 1 atmosphere.

Statement:

It means that 10 meters / 33 feet will be equal to 1 atmosphere.

Clarification:

It means that for every additional 10 meters / 33 feet of sea water, we will have to add 1 atmosphere.

Since at sea level, 0 meter / 0 feet = 1 ATM/BAR.
At 10 meters / 33 feet = 2 ATM/BAR
Hence, at 20 meters / 66 feet = 3 ATM/BAR

Hope this helps.

ScubaDivingFanClub
Where Scuba Divers share their passion.


Visitor's comments

Dec 06, 2010

To the guys who didn't get it. (who said your math sucks)
by: Anonymous


Actually he has it right. At Zero(0) depth as in when your head is above the water you are at one(1) Atmosphere. Once you go down 10 meters/33 feet that is equivalent to having another atmosphere above you, adding up to a total of two(2) atmosphere. When you see the chart (See Below) maybe it'll help me explain better.
So 3 Bars = 20m/66F = 3 ATM/BAR

Bar Depth Pressure
1 0 1 ATM/BAR
2 10M/33F 2 ATM/BAR
3 20M/66F 3 ATM/BAR
4 30M/99F 4 ATM/BAR
5 40M/131F 5 ATM/BAR
6 50M/164F 6 ATM/BAR
7 60M/197F 7 ATM/BAR
8 70M/231F 8 ATM/BAR
9 80M/264F 9 ATM/BAR
10 90M/297F 10 ATM/BAR
11 100M/330F 11 ATM/BAR
12 150M/495F 16 ATM/BAR
13 200M/660F 21 ATM/BAR


Jun 02, 2010

Clarification:
by: ScubaDivingFanClub.com

Clarification:
It means that for every additional 10 meters / 33 feet of sea water, we will have to add 1 atmosphere.
Since at sea level, 0 meter / 0 feet = 1 ATM/BAR.
At 10 meters / 33 feet = 2 ATM/BAR
Hence, at 20 meters / 66 feet = 3 ATM/BAR

Hope this helps


May 07, 2010


Your math sucks! 3x33 does not = 66. haha

by: Anonymous

Your answer to his question that 3 bars= 66 feet is wrong when you state in " How you got this" it shows 1 bar / ATM (atmosphere) equals 33 ft. Well 3 ATM multiplied by 33 ft as shown in your shart below equals 99ft., not 66ft.






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