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9-18-08[lecture6]si - CHEM 116 LECTURE NOTES[si...

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CHEM 116 LECTURE NOTES [si] 09-18-08 CONTINUATION OF LECTURE 5 AND LECTURE 6 Today’s Agenda Heating curves and phase diagrams Particle level models of phase changes Remainder of polar and nonpolar molecules learnt in chem. 115 Phase diagrams Comparison of intermolecular forces of attraction. Dew Point Curve of vapor pressure that weathermen call the Saturation Vapor Pressure The maximum partial pressure of water that can be held in the air at a particular temperature. Relative Humidity: The actual partial pressure of water in the air any given day/ (Saturation Vapor Pressure) Therefore, Relative Humidity =actual partial pressure /saturation vapor pressure Drop in temperature leads an increase in the relative humidity due to the saturation vapor pressure denominator decreases. Dew forms when the temperature drops to the point that the saturation vapor of water is equal to the partial pressure of water in the air.
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