This is a diagram of diffusion of air through a window.
Diffusion
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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The mesosphere of Uranus is a region of balance between warming and cooling. That essentially means that nothing happens there. Except for diffusion, the atmosphere is still. Upper reaches of the atmosphere,
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