Approximately how much denser is the air a diver breathes at a depth of 20m/66 ft compared to the surface?
Quiz - Physics - Air Density
- Thread starter Pedro Burrito
- Start date
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OP
I'm going to post a daily question from my exams to help newer divers and to encourage more experienced divers to interact gracefully and helpfully with the newer divers. Don't silt these up or you will be thread or forum banned.
Reminder - this is a post in the Basic Forum and it is a green zone.
Reminder - this is a post in the Basic Forum and it is a green zone.
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I think that the learning experience for the users would improve if we all didn't get the answer in a very short time. Use the spoiler tag (under the "+" icon on the top of your reply field) if you want to try to answer.
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I like the idea. Also a great way to pass time--besides posting on the "how do you pass time" thread! Are you gunna start another thread to create each poll? Where/when will the correct answers be posted--the next day?
OP
I drew the attached chart when I was taking my Dive Theory, DM and Instructor Exams. It's a quick and easy to remember reference. I also teach this to all of my beginning students.
During my Instructor Exams, one member of my team failed the Dive Theory exam. He was a very experienced instructor and was crossing over from another agency and had not put in enough time with the Dive Theory. The team gathered to review everything and we were able to help him pass the make up exam the next day. He memorized this chart and was able to both understand the answers and the questions.
During my Instructor Exams, one member of my team failed the Dive Theory exam. He was a very experienced instructor and was crossing over from another agency and had not put in enough time with the Dive Theory. The team gathered to review everything and we were able to help him pass the make up exam the next day. He memorized this chart and was able to both understand the answers and the questions.
ATM - Depth.pdf
I apologize, I cannot figure out how to insert a formatted table here.
Looking at the pdf linked above, at 20m/66ft you are at 3 atmospheres thus the density of the gas is 3 times as much as at the surface. Many people think that they are at 0 atmospheres on the surface so they answer 2 times the density.
Thank you for your patience while we try to give people something to discuss other than Covid-19 and/or Politics.
I apologize, I cannot figure out how to insert a formatted table here.
Looking at the pdf linked above, at 20m/66ft you are at 3 atmospheres thus the density of the gas is 3 times as much as at the surface. Many people think that they are at 0 atmospheres on the surface so they answer 2 times the density.
Thank you for your patience while we try to give people something to discuss other than Covid-19 and/or Politics.
- Messages
- 17,332
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I'm going to assume that you meant "density of the gas", not "density of the water"
OP
Ditto. I’m plowing through the DM eLearning this week. Just trying to keep doing something scuba
Rickk
Contributor
20 m is 2 bar water pressure plus one for surface pressure so the are is three times as dense.
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