What records the difference between still air and air that is being rammed into the system?

Still air is at atmospheric pressure and atmospheric temperature whereas rammed air has a higher pressure, higher density than the atmosphere and as a result, its temperature also increases.

Explanation:

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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