AVR-Chat

--- In AVR-Chat@yahoogroups.com, "Brian" <blue_eagle74@...> wrote:
>
> From what I know, as the water
> level rises the pressure at the
> bottom increases causing more
> of an uplift of an object held
> at the bottom.

OK, forget Archimedes, have a word with your tenth-grade physics teacher.

Bouyancy has nothing to do with pressure.  The upward force on an object imersed in a liquid is the weight of the liquid displaced minus the object's weight.  To a first approximation, this is constant with depth of imersion, which is why your idea is a bad one.

Arguing about second order effects is fine, but it's still a bad idea to use second order effects to make a measurement when sensors are available for the first order effect itself (pressure).  As others have posted, there will be a very small variation of the force of bouyancy depending on the relative compressibility of the liquid and the object.

Graham.