7. In the olden days we used to have milk in bottles delivered by the milkman. T

Question

7. In the olden days we used to have milk in bottles delivered by the milkman. The cream would rise to the top of the bottom, and occasionally a bird would come along and peck at the top of the bottle to get at the cream! Compare the milk bottle where the cream is still uniformly mixed with the milk, to the same milk bottle later on when the cream has separated and risen to the top. Does the hydrostatic pressure at the bottom of the milk bottle remain the same during the phase separation of the cream?

Explanation / Answer

Yes, net hydrostatic pressure at the bottom of the bottle remains same.

The hydrostatic pressure at bottom is given by

P= [rho*g* h] water + [rho g*h]cream

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