Just note that it does not take barometric pressure into account so at high altitudes it may be off by a few degrees. I chose this one as the results agreed with several commercial products. There are several versions of Dew Point equations in literature. The spreadsheet can even be adapted to applications where continuous measurements are being made via real time data acquisition. There are other online calculators, but we have released ours in spreadsheet form which we believe provides flexibility which allows you to modify it for other than a single point calculation. To simplify the calculation process, we have created an Excel Dew Point/Humidity calculator. Converting back and forth from relative humidity to dew point temperature can be done via mathematical calculations but the formulas can be quite complex. Although instruments are readily available by IOThrifty as well as other manufacturers to provide measurement of both relative humidity as well as dew point temperature, the instruments that measure only relative humidity are generally less expensive and more commonly available. For instance, the compressed air market typically prefers moisture content in terms of dew point temperature while the HVAC industry more often defines moisture content in terms of relative humidity. Often these applications are industry specific. Some applications require the moisture content expressed as relative humidity while others require the moisture content as dew point temperature. Both relative humidity and dew point temperature are measure of the amount of moisture in air or other gases.
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