Question

An instrument used to measure the density of milk is called a _________.

Answer 1

1. The relative density of pure milk is 1.045 and a simple hydrometer cannot record the small change in density of the milk caused due to adulteration of milk.
2. A special hydrometer called “lactometer” is used to measure the density of the milk very precisely.
3. A lactometer can measure densities within the range of 1 g/cm³ to 1.045 g/cm³.
4. A lactometer is made highly sensitive by reducing the area of the cross-section of its stem and increasing its length.

Hence, an instrument used to measure the density of milk is called a lactometer.