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[Phys-l] A Crude Attempt at Analysis



Assume a cubical volume of water. If we integrate the net force over the entire surface of that cube, we come up with a total force that is the weight of the fluid in that cubical volume.

ok so far? (I think I saw this a physics text - so it MUST be right.)

Let's position that cubical, mathematical volume directly ojn the glass at the bottom of my aquarium, positioned exACTLY such that there is not one single molecule of water below this mathematical volume.

It seems to me (naively) that we better come up with exACTLY the same total force when we integrate force around all SIX sides of this mathematical volume as we did the first time.

The pseudoContact force of the bottom is supplying exACTLY the same contribution to the total force as did the layer of water that used to be there.

Go ahead - shoot me down.
I ain't no theoretician and I CAN take a hit when it's called for.