Apiston-cylinder device contains helium gas initially at 150 kpa, 20 o c, and 0.5m 3 . the helium is now compressed in a polytropic process () to 400 kpa and 140 o c. determine the work and heat transfer done during this process.

Explanation:

Given

R for Helium

mass of gas

Similarly can be found

Work done

Since it is a polytropic Process

therefore

From Energy balance

Neglecting kinetic and Potential Energy change

Change in Internal Energy

i.e. Heat is being removed

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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