This is a diagram of diffusion of air through a window.
Diffusion means the slow steady movement of individual molecules from one region to another. As solid as a pane of glass can seem, molecules of air can easily diffuse, or pass through the glass. This can readily be noticed on a cold winter night! Diffusion of gas accounts for the way the smell of baking cookies can drift into the living room from the kitchen!
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This figure shows the effect of the aurora on the atmosphere. When FAC's enter the atmosphere and create the aurora, they warm the atmosphere impulsively. This impulse travels throughout the atmosphere...more