Question

If a drop of ink is placed into a glass of water, the ink molecules will spread evenly throughout the water. Why does this happen?

Answer 1

By diffusion.

Explanation -

The Ink molecule are able to squeeze into the empty spaces between the water molecule.

Answer 2

The ink molecules are able to 'squeeze' into the empty spaces between the water molecules. Hence it is able to spread evenly throughout the water. This process is called diffusion.