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The particles of matter are too small to be imagined
Add some crystals of blue vitriol (copper sulphate) and dissolve them in 100ml of water. The solution will go blue. Keep on adding 100ml of fresh water, repeat this 5 to 8 times. The last solution is till blue though the intensity of the colour has gradually decreased. This indicates that a few crystals of copper sulphate are able to colour an enormously large volume of water. This also shows that a small crystal of copper sulphate contains millions of small particles.