Air initially at 0.1 MPa, 27 degC, is compressed reversibly to a final state. Assume air is an ideal gas with constant specific heats. (a) Find the entropy change of the air when the final state is 0.5 MPa, 227 degC.

The entropy change of the air when the final state is 0.5 MPa and 227°C is 0.051 kJ/kg K

Explanation:

According the assumptions:

-air as ideal gas

-constant specific heats

The change of entropy is equal to:

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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