220 



THE WEATHER 



TABLE XII. WEIGHT IN GRAINS OF WATER VAPOR PER CUBIC FOOT 



AT SATURATION. (OR THE ABSOLUTE HUMIDITY AT DIFFERENT 



TEMPERATURES) 



PROBLEM 



Finding the Depth of Rainfall if All Moisture Were Precipitated. 



Supposing the humidity found in the foregoing problem extended to 

 the height of 2 miles, how much water would be suspended as vapor 

 above each square foot of ground? What would be the depth of 

 rainfall if all moisture were precipitated? 



SOLUTION: Humidity 3.14 grains per cu. ft.; in 2 miles depth 

 there are 2 X 5,280 = 10,560 cu. ft. above each square foot of ground; 

 10,560 X 3.14 grains = 33,158.4 grains = 4.737 Ib. of water. A 

 cubic foot of water weighs 62.4 Ib. and would be 12 in. deep; 4.737 

 4.737 ,-, ., , , 4.737 



Ib. 



is 



62.4 



cu. ft. I he rainfall would therefore be 



62.4 



ft. or 



