Question

Water in a container is mixed with dust, sand, and oil. How can we get the water back?

Answer 1

(1)The mixture must be kept at rest for some time to settle down the sand particles at the bottom of the container, and in the meantime, the two layers of oil and water will form as both have different densities.
(2)Oil can be separated by pouring out the oil layer from the water layer by decantation.
(3) Water can be separated from sand particles by decantation of water into a separate container.
(4)In the last step, the dusty, unclean water can be cleared by the filtration method. And we will get the clear water.