If the effect of humidity is neglected, the formula  oecomes:  If Tg =  Ta and there is no  superheat,  then:  Formula (3) may be accurate enough for rough computa- tions.  But even when more accurate results . are desired, it  may be found convenient to use this formula and to apply  quick corrections for humidity and superheat according to  the  following rules:  For less than  satu:ration by  100% humidity, multiply loss  %humidity.  in lift at  Air Temperature  Loss in Lift at Saturation  0°F  20oF  32°F  50°F  70°F  90°F  l00°F  l/20 of 1%  l/10 of 1%  l/5  o"f 1%  l/2  of 1%  1% less than dry air  1.8% less than dry air  2.5% less than dry air  LOSS IN LIFT CAUSED BY HUMIDITY  L =  CP  1325 - 185  (2)  Ta  Tg  L = 1140  CP  (3)  Ta  l.  For each 5°  of positive superheat,  increase  lift by 1%.  2.  For each 5°  of  by 1%.  negative  superheat,  reduce lift  3.  Correct for humidity  in accordance  with the  following table:  -7-