How Do Lactometer Works?

Lactometer is a small glass instrument that is used to test the purity of the milk. It works on the principle of specific gravity of milk (Archimede's Principle). It measures the relative density of milk with respect to water. If the specific gravity of a sample of milk is within the approved ranges, the milk is pure.

How does Lactometer show the purity of milk?

For milk testing, lactometer is dipped in milk which we are testing. In lactometer, the point up to which it sinks in the pure milk is marked after that put in water and marked at the point up to which it sinks in water. It sinks less in milk than water because as we know milk is denser than water.

How does Lactometer work on Archimedes principle?

A lactometer is an application of hydrometer and is used to check purity of cow's milk. It works on the principle of Archimedes' principle. The instrument is graduated into a hundred parts. ... If the milk sample is pure, then the lactometer floats on it and if it is adulterated or impure, then the lactometer sinks.