In post 16.37, we saw that the molecules in a liquid or a gas are free to move; in a gas they are free to move anywhere, in a liquid they are free to move anywhere below the surface. Now let’s think about what happens when we add a coloured liquid to a transparent liquid,… Continue reading 18.26 Diffusion

Before you read this, I suggest you read post 16.37. A gas will fill all the space available in a sealed container; it has no surfaces except where it meets the walls of its container (post 16.37). Let’s think about a gas in the cylinder (coloured yellow in the picture above) that is sealed by… Continue reading 18.25 An Ideal Gas