The height of the yellow fresh water decreases over time because of the phenomenon of diffusion. Diffusion is the movement of particles from an area of high concentration to an area of low concentration.
In this case, as the blue salt water and yellow fresh water mix together, the salt particles in the blue water will begin to diffuse into the fresh water. This means that the concentration of salt particles in the fresh water will increase, causing the water to become denser and therefore sink to the bottom of the container.
As more and more salt particles diffuse into the fresh water, the overall density of the water will continue to increase, causing the fresh water to sink lower and lower in the container. This is why, over time, the height of the yellow fresh water decreases as it continues to mix with the blue salt water.
For the mixture of blue salt water and the yellow fresh water,as the time goes on, the height of the yellow decreases why?
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