Posted by ed on July 12, 2002 at 13:39:56:
In Reply to: Sorry Ed, but that is BS posted by Eins on July 12, 2002 at 11:47:12:
The ball analogy IS relevant, as it demonstrates that it is not the 'absolute' weight that matters, but the density / water displacement, be it a 'ball' or a diver, or ANY object....
The weight belt (or any additional weight) is the ONLY variable to be adjusted, as the assumption is that the diver will wear the same wet suit, gear, etc. The estimate is based on this, that is, for scenario 1, the amount of weight needed to 'compensate' and achieve neutral buoyancy was x amount, and in scenario 2, the compensation weight is adjusted (as it is the only variable) to obtain similar results.
Also, if you recall from my original post, I mentioned that the best way to achieve this is by an actual buoyancy test, which is simple and straightforward. Especially that in any given day, most people's weight fluctuates by up to several pounds, whereas there 'volume' does not necessarily change in proportion.