Perpetual motion machine #2

Torus machine

How it doesn't work

The flaw here is at the points where there are holes in the barrier. Consider that the pressure in a fluid increases with depth and also with the average density of the fluid. Therefore, to balace the anti-clockwise force, due to the extra upthrust on the right-hand side of the torus, there is a clockwise force due to the fact that there is an extra pressure difference on the lower hole. This can be proved to be of the exact same magnitude as the upthrust difference (and I may even put the maths on here when I have time.).
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