Question

What is the effective density of the mixture of water and milk when
i) they are taken with same masses​

Answer 1

Answer:

The density of milk, 1.03 g/ml, is very close to that of water. So, regardless of the proportions of water and milk, the density would be very close to 1 g/ml.

If you were trying to determine the density to the nearest 0.01 g/ml or the nearest 0.001 g/ml, you would have to know accurately the density of a specific batch of milk, The densities of regular milk, low fat milk, skim milk, etc. would vary somewhat.