IGCSE Marine science: Experiment with Diffusion

 In section 2.1 diffusion is mentioned.

We can use particle theory to explain how different substances mix with eachother.

Particles in liquid or gas are able to move, and here is an experiment that shows how temperature can affect the rate of diffusion

For this experiment you need:

2 beakers or glasses
A heat sourcer
Food dye

Have the 2 containers contain water of different temperatures. One as cold as possible and another one at least 40 degrees. (always be carefull when working with hot water and heat sources)
Make sure they both are still and there is no movement from handeling.
Add a few drops of food dye to both, and observe how fast the dye spreads in the water.

What you hopfully will see is that diffusion is faster in the hot water

Diffusion in water is the process by which molecules move from an area of higher concentration to an area of lower concentration. This movement occurs naturally as molecules are constantly in motion due to their kinetic energy. In water, diffusion allows substances such as salts, gases, or nutrients to spread out evenly throughout the liquid over time, resulting in a uniform distribution without the need for external force.

Its important to remember that this movement from an area of higher concentration to a lower concentration happens because of random movement of the particles, not because that the particles "know" where to go.

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