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The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
Everything around us, including our bodies is made up of particles. These particles are so small it is impossible to pick them up and view with the naked eye. To give you an idea of how small particles are, if you imagine a small raindrop, it contains over 1000 000 000 000 000 000 000 particles-amazing!But if particles are so small that we cannot see them, what evidence dowe have for their existence?o give you an idea of how small particles are, if you imagine a small raindrop, it contains over 1000 000 000 000 000 000 000 particles-amazing! But if particles are so small that we cannot see them, what evidence dowe have for their existence?