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






"Dave Doe" wrote in message
. nz...
In article ,
says...

"Dave Doe" wrote in message .

Water weighs the same above or below the waterline, and
the
same in or
out of water assuming the same gravitational potential.

No it doesn't!

The *mass* is the same.

Take a plastic bag of water and push if off a bench.

Take the same and do the same off a wee bench in a tub of
water.



Dave, the water in a ballast tank is KNOT IN the water.

Sheesh!!!!

Neither is the water in the plastic bag!

Sheesh!

--
Duncan