Question

How does a lactometer work ?

Answer 1

Answer:

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A lactometer is used to check purity of cow's milk. Milk is poured in and allowed to stand until the cream has formed, then the depth of the cream deposit in degrees determines the quality of the milk. If the milk sample is pure, the lactometer floats; if it is adulterated or impure, the lactometer sinks.

Answer 2

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A Lactometer is a little glass instrument that tests the purity of milk based on density/buoyancy. It is basically a glass tube with a round shaped bottom containing a liquid of certain density inside it. The liquids will rise/fall inside the tube depending upon the pressure and depth.

It is based on the Archemedes' principle. When we put loctometer inside the liquid it experience buoyant force(weight of displaced fluid). Hence measures relative density in the given scale of loctometer. Lower the density of liquid farther, the loctometer will sink.