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Explain the pressure - volume isotherms of Carbon dioxide Andrew's isotherm. |
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Answer» Solution :(i) Andrew's ISOTHERMS of carbon DIOXIDE at different temperactures is shown in figure From the plots we can infer the FOLLOWING. (ii) Atlow temperature isotherms, for example, at `13^(@)C` as te pressure increases, the volume decreases along AB and is a gas until the point B is reached. (iii) At B, a liquid separates along the line Bc,Both the liquid and gas c-oexist and the pressure remains constant. (iv) The volume range is which the liquid and gas coexist becomes shorter. (vi) At the temperature of `31.1^(@)C` the length of the shorter portion is reduced to zero at point P. (vii) The `CO_(2)` gas is liquefied completely at this point. This temperature is known as the LIQUEFACTION temperature or critical temperature of `CO_(2)` at this point the pressure is 73 atm. (viii) Above this temperature `CO_(2)` remains as a gas at all pressure values. 
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