Extrapolate Weight Requirement?

If I get correctly weighted (as per text book and training) in my local dive
shop's (freshwater) tank, is there a reliable way to calculate the extra weight
that would be needed in salt water with exactly the same gear?

On Thu, 1 Jul 2004 10:14:54 +0100, "NoJags Neil"
<neil264removethisbit@andthisbithotmail.com> wrote:

>If I get correctly weighted (as per text book and training) in my local dive
>shop's (freshwater) tank, is there a reliable way to calculate the extra weight
>that would be needed in salt water with exactly the same gear?
>

Yes, you can take the total weight of you and all your kit then
adjust for the different density between fresh and salt water (about
3% I think but someone will come along and correct my soon)

Or alternatively you can just bung on another 2 or 3 Kg like the rest
of us


--
Pete

news 'at' melbourne 'dot' me 'dot' uk

NoJags Neil wrote:
> If I get correctly weighted (as per text book and training) in my local dive
> shop's (freshwater) tank, is there a reliable way to calculate the extra weight
> that would be needed in salt water with exactly the same gear?

Average salinity of ocean water is 3.7% (IIRC), and I think elevator
makers use 80kg as average human weight. 65% of human flesh is water,
at 0.9% salinity level (then again, it's not NaCl really). Chances are
at any useful depth, the water will be about 4C in the sea (dense), and
warmer in the lakes/rivers/ponds... so if we now calculate 80*0.037*salt
mass... of forget it!

Grab an extra 2kg as Pete suggested

/Marcin

> If I get correctly weighted (as per text book and training) in my local
dive
> shop's (freshwater) tank, is there a reliable way to calculate the extra
weight
> that would be needed in salt water with exactly the same gear?

4lbs works for me.

Matt.