roswell

359 x ~73.2 - 59.5 X 1013.3 • 2370 ft.3 (the mean molar volume .;.;73.:2 1.20 at 15 km for Jan.l943 over Lakehurst,N.J.) This volume data was computed for all lovels given. Data was "borrowed" from ot.aer stations in tne same latitude to piece out the 20 km soundings as needed. II. Lifts were computed for various molor volumes for balloons between 7. 5 am 75 feet diameter in the following manner: Given purity of Hydrogen 99."7% impurity as oxygen 0.3% computed molecular wt. 2.11 #1 mol Molecul~r weight of dry .9.ir as computed from date. re:Jorted at 10 km. in Ha.nibook of Chemistry am Physics • .28.764 #1 mol To find the lift of a 20'D balloon at an altitude where the molar volume is 1000 ft.3: Volume 20 ft.D Balloon = 4190 ft.3 Lift/BalloonBalloon Volume X(Difference in molecular wgts.of air#hgn Molar Volume at a given altitude or Total Lift of gas in #/Balloon= ft. 3/Balloon X ( ft.3/mol for the 40 foot diameter balloon: #/mol) Lift = 419° (.28.76 - 2 •11) = 111.7.# lift from a 20 foot diameter 1000 sphere of hydrogen at an altitude where the molar volume is 1000 ft.3. The lifts were plotted against molar volume for each size balloon. The .altitudes corresponding to various molar volumes for Lakehurst am Albuquerque in January and in August 1943 as computed above were plotted on t)e left margin of the chart. The family of curves was plotted on log ?aper and is included in the append~{ with the basic sounding data. - 30 -