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The good people at
Linric Company, of Bedford, NH, provide this Psychrometric Chart as a free download. They sell
PsycPro software. Here is a link for free
ET_AEE software that performs calculations for you. Psychrometry is the study of moist air. The
psychrometric chart displays the relationship between dry-bulb, wet-bulb, and dew point temperatures, and specific
and relative humidity. Given any two, the others can be calculated. To use the chart, take the point of
intersection of the lines of any two known factors (interpolate if necessary). and then from that intersection
point, follow the lines of the unknown factors to their numbered scales to obtain the corresponding values.
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