Lactometers, which are used to determine the purity of sample of milk, works on which principle? 

Key Points

• Archimedes principle is the principle on which lactometers work to determine the purity of milk.
• According to Archimedes' principle, a body immersed in a fluid experiences a buoyant force equal to the weight of the fluid displaced by the body.
• A lactometer is a hydrometer used to measure the specific gravity (relative density) of milk, which in turn indicates its purity.
• The specific gravity of milk is influenced by its composition, including the amount of water, fat, and other solids present.
• By floating in the milk, the lactometer indicates whether the milk has been adulterated (typically with water) based on how deep it sinks.

Additional Information

• Archimedes of Syracuse was a Greek mathematician, physicist, engineer, inventor, and astronomer who formulated the principle now known as Archimedes' principle.
• This principle is fundamental in fluid mechanics and is used in designing ships, submarines, and various instruments like hydrometers and lactometers.
• Archimedes' principle also explains why objects float or sink in fluids, which is essential in understanding buoyancy.
• The principle is also crucial in various applications, including measuring the density of liquids and solids.