How deep is 3 bars and could you use a
watch that is limited to 3 bars for any serious diving?
The answer to your question is: 3bars = 20 meters or 66 feet.
Now we will explain how we came up to this response.
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
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.
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
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.
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:
Where Scuba Divers share their passion.
Some corrections have being made
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
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.
It means that 10 meters / 33 feet will be equal to 1 atmosphere.
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
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.