Question

A lactometer is a type of hydrometer used for determining the purity of __________.

Answer 1

1. Lactometer is a small glass instrument that is used to test the purity of the milk.
2. It works on the principle of specific gravity of milk (Archimedes' Principle).
3. It measures the relative density of milk with respect to water.
4. If the specific gravity of a sample of milk is within the approved ranges, the milk is pure.
5. If it is not, then there is some adulteration.

Hence, a lactometer is a type of hydrometer used for determining the purity of milk.