If it weighs more it just means more of the canoe submerges under the water (so its still the size/mass of the object that is equivalent to the amount of water displacement). Weight is an indirect way to say it.

what about thermal vents? water near thermal vents on the ocean floor can be over the boiling point (100 degrees C) and still remain a liquid because of the pressure

You guys are both going off topic here, the question is whether pressure changes, so if there were thermal vents so what? AFTER you place the boat on that column of water, does the pressure 'change' and I think it was a unanimous no

you might of said no, but you didn't back it up with anything?

I'm pretty sure a couple other people said no

edit: but ur right mine was just an intuitive guess based on what i know.

This post was edited by BovineDesi on Jan 4 2009 07:52pm

Second sentence said I didn't know how the relation works.


where,
P is the hydrostatic pressure (Pa);
ρ is the liquid density (kg/m3);
g is gravitational acceleration (m/s2);
h is the height of liquid above (m);
Pa is the atmospheric pressure (Pa).

and I guess the relation would be the product of the other 2 things I mentioned (plus atmospheric pressure).


Given that I would imagine in a situation like a lock the pressure would be greater given that the water remains constant (larger ship will displace more water, increasing the height of the liquid above where you would be measuring water pressure).

I don't know enough about the way locks work to be able to give an answer for the initial question. If it were just in the ocean I would imagine that the change would be negligible.
It would be a great question for my physics professor to answer... too bad I'm not taking physics this quarter.

This post was edited by LouisLeGros on Jan 4 2009 07:59pm

Right.