Oh, thanks for clearing that up.


Regards,
Angelo Pardinas
Ministry of the Environment (Singapore)
EMail : [log in to unmask]
DID : (65) 731-9096






                    David Strike
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                    02/10/01 12:20
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On Tuesday, October 02, 2001 1:38 PM, Angelo Pardinas wrote:

>   That reminds me - what does FSW and FFW mean ? "Foot Saltwater" and
"Foot
> Freshwater" ? Assuming my guess is correct  - would there be any
difference
> between 10 FSW and 10 FFW ? Is 10 FSW longer than 10 FFW ?

Hi, Angelo!  Because of dissolved salts, sea water is denser than
fresh-water.
1 litre of fresh water weighs   1 kilogram
1 litre of sea water weighs    1.025 kilogram
1 cubic foot of fresh water weighs  62.5 pounds (approx.)
1 cubic foot of sea water weighs   64 pounds (approx.)

1 Atmosphere

In salt water (FSW), each 33.05 (33) feet that the diver descends is the
equivalent of an additional atmosphere of pressure exerted on their bodies.
In fresh water (FFW), it's 33.95 (34) feet.

Strike