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2.5 grms per cu ft
450 " " [[dittos for grms per]] pound
2.5 ) 450. ( 180 = cu ft to lb

900 ) 110.0 ( .122
[[calculation under 110.0 above]]
900
[[line]]
2000
1800
[[line]]
200
[[/calculation under 110.0 above]]

[[multiplication calculation]]
13
50
[[line]]
650
[[/multiplication calculation]]

[[calculation]]
5000
180
[[line]]
400000
5000
[[line]]
900[[strikethrough]]000[[/strikethrough]]
[[/calculation]]

[[calculation]]
[[strikethrough]]
13
9000
[[line]]
7000
[[/strikethrough]]
[[/calculation]]

18[[strikethrough]]0[[/strikethrough]]0 900[[strikethrough]]0[[/strikethrough]] (50
90
[[line]]

180 ct ft to lb of H. Air weighs 14 times = 14 lbs
[[underlined]] Hence 180 [[/underlined]] lb H have [[underlined]] 13 [[/underlined]] lbs ascentional force.

[[line]]
.06 ) 1.00 ( 16
6
[[line]]
40
35
[[line]] 
4
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