Put potassium permanganate in water, Heat gently underneath the purple crystal, The water above the crystal heats up as the particles get more energy, Because the particles have more energy they move faster and take up more space, Now the hotter water is less dense than the water around it, so it rises, Colder water is sucked into the space left by the hot water rising, This sets up a convection current, Heat energy is spread throughout the water by the convection current.

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