Question

activities to demonstrate diffusion of a liquid in another liquid

Answer 1

1 take a glass of water and put a drop of ink in it
2 leave it for 1 day
3after that you will see that the whole ink has been mixed automatically 
this shows us Brownian motion in water.

Answer 2

Answer:

Put a drop of blue ink slowly along the sides of the first beaker and honey in the same way in another beaker. Leave it undisturbed. We observe that honey diffuses slowly as compared to ink. This experiment shows that lesser the density, faster the rate of diffusion.