12/24/2023 0 Comments Dew point vs humidity calculator![]() ![]() Dew point tells you what the partial pressure of water vapor is in your sample.ĭid you test the dew point at 8 bar or at ambient? If the sample was tested at ambient then the patial pressure of water in your process is actually 8 times higher than the tested sample. You need to refer to a vapor pressure curve for water. Basically you selected the wrong chart to solve your problem if you are working with H2 gas. The tables that are in weight percent are designed for engineers who often need to calculate weights and percentages. The trick to understanding the humidity tables is to remember its related to the vapor pressure of water and to work (or think)in units of partial pressure (mmHg) as a chemist would. If you add more air to this container and double its pressure the dew point and relative humidity do not change but the weight percent of water in air is cut in half. This air would be called saturated and at 100% relative humidity and the dew point would be 20C. A one liter container of air at 20C cannot contain anymore water vapor than the vapor pressure of water at 20C. In this case it is that water, like any liquid, has a well defined relationship between its temperature and its vapor pressure, and the vapor pressure is not affected by other gasses that are present. can get very complicated if you don't keep in mind the fundamental principles. The topics of relative and absolute humidity, moisture content, dew point, etc. ![]()
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