Lactometer is based on

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Law of gravitation

Bernoulli’s theorem

Archimedes principle

Pascal law

answer is C.

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Detailed Solution

Lactometer works on the Archimedes principle.
According to the Archimedes principle, a body floats due to the upward force exerted by the liquid. This force is equal to the weight of the liquid displaced by the floating object. Lactometer is based on Archimedes' principle. It measures the relative density of the milk and finds its purity by comparing the relative density of the sample milk with the standard milk sample.

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