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Classical Physics
Does gravity affect Brownian Motion?
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[QUOTE="TeethWhitener, post: 6585868, member: 511972"] That has less to do with diffusion differences and more to do with the fact that convection operates differently in microgravity. Basically, hot air rises in a gravitational field because it is less dense than cold air. In microgravity, this buoyant force doesn’t exist or is much smaller, so that the hot carbon dioxide generated by a flame does not rise away from the flame to make way for fresh air to sustain the reaction. You can model this straightforwardly by adding a gravity term to the Langevin equation $$\dot{\mathbf{v}}=-\gamma\mathbf{v}+\sigma\mathbf{\xi}(t)-\mathbf{g}$$ Gravity will pull denser particles in the direction of the gravitational source, but if the noise term is large (at higher T, for instance), or the drag term is large (at higher density, for instance), then gravity will become irrelevant. [/QUOTE]
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Does gravity affect Brownian Motion?
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