The cgs unit for measuring the viscosity of a liquid is the poise [p]: 1 p = 1 g/(s·cm). the si unit is the kg/(s·m). the viscosity of water at 5°c is 2.06 ✕ 10-3 kg/(s·m). express this viscosity in poise.

Explanation:

We have that

if the viscosity of water at 5°C is:

To express this quantity in poise, we have to go from SI units to CGS units, we can do that by replacing kilograms by grams and meters by centimeters.

we know that:

Inserting this into the preceding equation we have:

Where or centipoise is a hundredth of a poise

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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