Diffusion occurs when an area of high pressure meets an area of low pressure. They mix together and create an equilibrium, all particles spread out equally.
A fluid will move from high pressure to low pressure.
Air rises in a low pressure area and sinks in a high pressure area.
low pressure
A stationary front would be associated with an area of low pressure (high pressure does not have fronts).
Low pressure
Air.
High pressure areas
Air mass - refers to any area of high or low pressure. A front - is the point at which an area of high pressure meets an area of low pressure.
Air.
Yes, it does move from areas of high pressure to areas of low pressure. If it didn't we would have no such thing as wind.
low
high pressure most likely