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Effusion is the process in which gas molecules escape from a container through a small hole or opening into a vacuum or another container. It is a result of the random motion and collisions of the molecules within the container. When these collisions lead to a molecule approaching the hole with the right speed and direction, the molecule escapes and doesn't return.

Diffusion, on the other hand, is the process in which molecules spread out and evenly distribute themselves within a given space. This happens due to the random motion of the molecules as they move from areas of higher concentration to areas of lower concentration. Diffusion is not limited to gases, it can also occur in liquids and solids.

The main difference between effusion and diffusion lies in the way the molecules move. In effusion, gas molecules escape through a small opening from a container; whereas in diffusion, the molecules spread out within a given space or mixture. Another key difference is that effusion occurs only in gases, while diffusion can happen in gases, liquids, and solids.

The rate of both effusion and diffusion depends on the properties of the molecules and the medium they are in. For instance, lighter and smaller molecules tend to effuse and diffuse faster than heavier and larger ones. Additionally, pressure and temperature also play a role in determining the rate of these processes. Higher pressure and temperature generally lead to an increase in the effusion and diffusion rates. In summary, effusion and diffusion both involve the movement of molecules, but their mechanisms differ. Effusion is the escape of gas molecules through a small opening, whereas diffusion is the spreading of molecules within a space or mixture. The rate of these processes depends on factors like molecular weight, pressure, and temperature.