A rigid tank contains 2.5 lbm of R-134a, initially at 80 psia and 180 oF. The fluid is then allowed to cool until a final temperature of 45oF is reached. Calculate the final pressure and the change in internal energy (Btu) of the fluid.

specific latent heat of fusion, lf, of a substance is defined as the amount of heat required to change a unit mass of the substance from solid to liquid state, without any change in the temperature.

explanation:

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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amplitude

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