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To: techdiver@opal.com
Subject: Re: Manifolds, bends, bars, etc.
From: "John Gibbons" <jgibbo@ph*.lo*.ac*.uk*>
Date: Wed, 22 Mar 95 09:47:03 GMT

<Answer (straight forward): He has a total volume of 200 * 10 l of air at
1 bar. In 20 m depth we have 4 bars, so the divers has 4 times less volume
to breathe than at the surface = (200 * 10)/4 l. As he consumes 20 l/minute
he can stay (200 * 10)/4/20 minutes = 25 minutes (we don't account for the fact
that he cannot empty the tank completely due to the pressure of 4 bars).>

Try again---- the absolute pressure at 20m =   3 bar not 4 (1 bar 
atmospheric and 2 bar from the depth of water)

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