The high speed of gas particles, coupled with the large spaces between them, enables gases to diffuse rapidly into other gases. This rapid diffusion occurs as gas particles move randomly and spread out to fill any available space, mixing with other gases in the process.
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Gases diffuse very quickly into other gases due to their molecular nature and properties. Gas molecules are in constant random motion, moving at high speeds and colliding with each other and the walls of their container. This kinetic energy causes them to spread out and fill available space. The relatively large distances between gas molecules compared to their size mean there is less resistance to their movement, allowing them to mix rapidly.
Additionally, the lack of significant intermolecular forces between gas molecules means they do not stick together and can easily intermix. The higher the temperature, the more kinetic energy gas molecules have, further increasing their speed of diffusion. As a result, when gases are in proximity to each other, they quickly and evenly mix, diffusing rapidly due to these properties.