Answer;
-A liquid can diffuse into another liquid.
-A gas can diffuse into another gas.
-A solid can diffuse into a liquid.
-A solid cannot diffuse into another solid.
Explanation;
-Diffusion is the process by which particles of a substances moves from a region of high concentration to a region of low concentration (down the concentration gradient).
-Diffusion occurs in all states of matter; solid, liquid, and gas. It occurs rapidly only in liquids and gases. The solid molecules are too tightly packed together making it difficult for other molecules to diffuse.