HydrologyMidtermSG - *Multiple Choice Questions...

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*Multiple Choice Questions Significance of 4 ° C Water When the temperature of water reaches 4 ° C, hydrogen bonding becomes stronger than the liquid’s tendency to shrink. Molecules are progressively arranged along lines of hydrogen bonds, resulting in gaps between the lines. This causes a decrease in density and an overall expansion in volume. Properties of H2O – Surface Tension The surface tension of water is two or three times higher than that of most common liquids due to the hydrogen bonding. The surface tension of water decreases with increasing temperature, and it may also be affected by chemical additives. Relative Humidity Humidity- a given volume of air can hold just so much water vapor at any given temperature and pressure. Saturated air has a relative humidity of 100% Humidity less than 100% indicates the potential of moisture the air can hold. temperature = moisture the air can hold. Pg 23 Overturning Water in Lakes Pg 28 Class A Pan Evaporation The pan gets too hot as a result you get more evaporation in the pan than a reservoir b/c it has a heater. Class A Pan’s coefficient is .7 and the reservoir is 1.7. Multiply Class A Pan evaporation by .7 = the estimated reservoir’s evaporation. Pg 43 Convective Precipitation = surface heating Convection- the process of heat transfer from one place to another by the actual motion of hot liquids or gases. Pg 44 Orographic Precipitation
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This note was uploaded on 04/02/2008 for the course HWR 202 taught by Professor Clark during the Spring '08 term at University of Arizona- Tucson.

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HydrologyMidtermSG - *Multiple Choice Questions...

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