Molecules are too small to be seen with the human eye, but their existence can be demonstrated by Brownian motion and diffusion.
Matter can exist in three physical statuses – as a solid, a liquid and a gas. The kinetic theory explains the structure and behavior of substances in these states in terms of their molecules.
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2. Solids move slow, Liquids move medium fast and Gases moves constantly.
3. Ice is less dense than water.
4. Pure water PH value is 7.