Temperature and the shape of the containers affected the rate of diffusion in both experiments. Particles move faster in warmer water, so the red coloring spread more quickly through the cup.
Since the molecules in warm water move around faster, the food coloring spreads out quicker in the warm water than in the cold water.
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The hot water causes the food coloring to diffuse faster. At higher temperatures, particles move faster. This faster movement allows diffusion to occur more quickly.
The temperature of a substance is a measure of the average kinetic energy of the particles. A change in phase may occur when the energy of the particles is changed.
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