Question

Ram wants to measure the purity of the milk which device he will use for this explain the principle of which device is best arrange the following in increasing order of their relative density and air water

Answer 1

Lactometre is the device used to measure the purity of milk. Pycnometre and hydrometre is used to measure the relative density.

PLZ MARK IT AS BRAINLIEST.

Answer 2

Lactometer is the device which is used to check the purity of milk.
This device works on the "Archimedes Principle"

Archimedes Principle states that when a body is immersed fully or partially in a fluid , it experiences an upward force which is equal to the weight of fluid displaced by it.