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The condition that it just does not overflow is that when it is just full, the buoyancy generated is exactly equal to the pressure of the water on the valve, and now we will calculate the buoyancy and the pressure of the water on the valve.
Pressure = Pressure * Area = RGH * S = 1 * Squared.
Buoyancy rgVp row - the weight of the float itself.
The two are equal, i.e., rgh*s=rgv row, where V row = in the above equation, only h is unknown, and it can be solved.
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