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Solution

When dye fell into swimming pool, it spreads throughout the water in a process called diffusion. It continues to spread until all parts of the water contain an equal concentration of the dye.

Diffusion rate can be speed up by:

heating, shaking or stirring the water.

1.Heating the water excites the dye particles, causing them to move more quickly.

2.Stirring or shaking physically moves the dye throughout the solution.

Once an even concentration is reached, the dye molecules continue to move.

Diffusion rate can be slow down by:

Using thick layer of oil, by increasing temperature.

1.Oil evaporates very slowly and does not mix with water. So oil floats on top of water, covering all the water you have.

Thicker the oil layer,less rate of diffusion

2. By lowering temperature or by increasing humidity will lower diffusion rate.