In a low pressure situation, gas particles are relatively spread apart, moving freely and rapidly with minimal interactions between them. This occurs because the external pressure acting on the gas is low, allowing the particles to occupy a larger volume. Visually, you can imagine these particles as small dots scattered widely in a container, with significant empty space between them.
In contrast, in a high pressure scenario, gas particles are pushed closer together due to the increased force exerted on them by the surrounding environment. This results in more frequent collisions between particles, and they occupy a smaller volume. In a diagram, gas particles under high pressure would appear more clustered together, with less space in between each dot.
In summary, the key difference between low and high pressure environments for gas particles is their density and the space between them: low pressure means greater distances and fewer interactions, while high pressure results in crowded particles experiencing more frequent collisions.