Which of the following instruments is used to determine the purity of milk based on Archimedes' principle?
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A.
Thermometer
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B.
Lactometer
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C.
Barometer
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D.
Hydrometer
Correct Answer:
B. Lactometer
Explanation:
A lactometer is the specific instrument used to verify the purity and density of milk, operating based on Archimedes' principle of buoyancy. This principle states that a solid body immersed in a liquid is buoyed up by a force equal to the weight of the liquid displaced. Since milk density varies depending on its composition and water content, the lactometer sinks to different levels to provide an accurate reading of its quality. Other instruments listed serve different purposes: thermometers measure temperature, barometers measure atmospheric pressure, and hydrometers are used for the general density of various liquids. Therefore, the lactometer is the correct tool for determining milk purity.
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