The random thermal motion of molecules from a region of higher concentration to a region of lower concentration is called diffusion. the rate of diffusion across a barrier is defined by fick’s law of diffusion:

Explanation:

Fick's law of diffusion describes the times course of transfer of matter from a region of high concentration to a region of lower concentration separated by a thin barrier membrane.

Mathematically:

where:

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

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