The small capillaries in the lungs are in close contact with the alveoli. a red blood cell takes up oxygen during the 0.5 s that it squeezes through a capillary at the surface of an alveolus.

what is the diffusion time for oxygen across the 1-μm -thick membrane separating air from blood? assume that the diffusion coefficient for oxygen in tissue is 2×10−11m2/s. give your answer to 1 significant figure.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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where’s the list ? the question is incomplete

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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joke:

h o h o hope you have a merry christmas!