content_image/554139.jpg content_image/554140.jpg content_image/554137.jpg
If the effect of humidity is neglected, the formula oecomes: 

<img src='content_image/554139.jpg'>

If Tg = Ta and there is no superheat, then: 

<img src='content_image/554140.jpg'>

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: 

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: 

<img src='content_image/554137.jpg'>

## LOSS IN LIFT CAUSED BY HUMIDITY 

For less than satu:ration by 100% humidity, multiply loss %humidity. in lift at 

