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Subject:RE>>Manifolds, bends, bars, etc. Sent on: 22/3/95 8:33 am
OOPs ---
At 20m we have 3 bar not 4 bar - but the rest of the maths is right !
--------------------------------------
Date: 21/3/95 11:51 pm
To: Graeme Davison
From: Michael Walz
>
> If I remember from my 8th grade new math course
> 1=meter
> .1=decimeter
> .01=centimeter
> .001=millimeter
>
>
> 1000=kilometer
> 100=decameter
> 10=???????? What's 10=
> 1=meter
> .0=deci
> etc etc
> Jeff
>
100=decameter wrong !! it should be 10=decameter, but anyway decameter
is not commonly used.
100=hektometer, but this is not used either.
Further more:
10 meters of water is 1 bar
weight of one liter of water = 1 kg
volume of one liter of water = 0.001 m^3
Easy isn't it ?
Question: a divers has a breahting rate of 20 liters/minute. He has a
10 l (liter) tank filled with 200 b (bar). How long can he stay at
30 m (meters) ?
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).
Imaging the same question with US units.
Michael Walz
walz@la*.ep*.ch*
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