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That happens when - as is the case in a gas for example - the distribution of probabilities, when graphed, is not symmetric. The "most probable particle speed" probably refers to the maximum of the curve, and this is not necessarily equal to the average.

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14y ago
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12y ago

In a vacuum, the size of particles is not affected by size, but when the particles are moving through a fluid such as air or water, the resistance of the fluid will affect their motion. In general terms, the friction between the particle and the fluid will be proportional to the surface area, but the mass will be proportional to the volume so doubling the dimensions will multiply the surface area by a factor of 4 but multiply the volume (and hence mass) by a factor of 8. As particle size increases, the kinetic energy and the momentum increase faster than the surface area so the friction between the particle and the fluid has less effect proportionately. Sand falls faster than dust for this reason.

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Q: Why do different size particles move at different speeds?
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