This is a diagram of diffusion of air through a window.
Diffusion means the slow motion of molecules from one place to another.
As solid as a pane of glass can seem, molecules of air can easily pass through the glass. You can easily notice this on a cold winter night!
Diffusion is the name for the way the smell of cookies baking 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 heat the atmosphere suddenly and abruptly. This creates an impulse which travels...more