Whoa Davey
Here's a better idea.... jump in the water and see how much water you
displace. If you displace a lot ...as I suspect... you should still float
well enough to undertake the test due to the residue of hot air.

Now drink a quarter bottle of Lamb's Navy Overproof Rum and see where you
float... continue drinking and take readings at every quarter mark of the
bottle.

Get Back to Us on Water Ballast.... we'll inform the multi national sailing
franchises of your position that they're delusional and water ballast is
ineffective.
I'm certain someone would be willing to write a "definitive book" regarding
your findings.

CM

"Dave Doe" wrote in message
. nz...
In article ,
says...
OK, Duncan. here's a little experiment you can do in your
bathtub.

1. Put an empty Coke bottle in the water. Observe how it floats.
2. Fill the Coke bottle 1/4 with water. Observe how it floats.
3. Fill the bottle 1/2 way. Observe how it floats
4. Fill it 3/4 full. Observe how it floats
5. Is the water in the coke bottle below the tub water surface?
6. Wash your butt last.

Scotty

a) What is the *point* of your experiement? - other than to only prove
my argument correct.

b) try this (your experiment pretty much, say 4) ...

So 3/4 full. Hold the bottle at the top and note the weight. Slowly
lower it into the water. Note the weight changing! ??? How can it be
getting lighter all by itself?

Note also the final level in the water. There is almost no difference
in the level of the water in the bottle and the level to which it has
sunk. (The difference being a result of the boyancy of the plastic).

ie, Ans to your Q5. the level of the water in the bottle is very
slightly higher than the water it is in.

PS: experiment not conducted, just using simple physics. Feel free to
do it and get back to me if I'm wrong.

--
Duncan
[Farr 7500 'Hi-Time' http://hitime.no-ip.info]