Question : Lactometers (used to determine the purity of a sample of milk) and hydrometers (used to determine the density of liquids) are based on the ______ principle.
Option 1: Archimedes
Option 2: Special Relativity
Option 3: Relativity
Option 4: Uncertainty
Correct Answer: Archimedes
Solution : The correct option is Archimedes.
Lactometers and hydrometers are both based on Archimedes' principle. This principle states that an object submerged in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces. In the case of lactometers and hydrometers, they float in the liquid being tested, and their buoyancy is affected by the density of the liquid, allowing for measurements related to purity (as in the case of lactometers for milk) or density (as in the case of hydrometers for various liquids).
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