# Determining Dewpoint and Relative Humidity

Jun 2nd, 2016
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This is a tutorial PowerPoint which describes with text, graphs, and highlights how to calculate Dewpoint and Relative Humidity from known dry and wetbulb temperatures. It is an excellent tutorial for those who need guidance.

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Dewpoint and Relative Humidity CalculationsVocabulary Review:Dewpoint: Temperature at which dew forms, air isfully saturated with water vapor, Relative Humidity is100%.Relative Humidity: Percentage of water vapor in air, thehigher the humidity, the higher the percentage.Click on the mouse to proceed with this exercise.The charts are located on pg. 12 of the Earth Science Reference Tables, 2010edition. The one shown below is for calculation of Dewpoint. Please note thefollowing.There is a column for Dry-Bulb Temperature ( 0 C )There is a row for theDifference between WetBulb and Dry-BulbTemperatures ( 0 C )The actual numbers in theChart represent theDewpoint ( 0 C ) for theconditions stated in thehighlighted column and row.Note the chart for RelativeHumidity (%), also on pg.12, has the same basicconfiguration.For these problems DB represents Dry-Bulb Temperature ( 0 C ) and WBrepresents Wet-Bulb Temperature ( 0 C ).Problem 1: Determine the Dewpoint ( 0 C ) using a DB reading of 120 C and a WBreading of 100 C.Step 1: Find the difference between theDB reading (12 0 C) and the WB reading(100 C). The difference is 2. Find 2 in theDifference Between Wet-Bulb and DryBulb Temperatures ( 0 C ) row.Step 2: Find the value of 12 inthe DB column.Step 3: Find where the valuesintersect.The answer is 8 0 C. This means the Dewpoint for these conditions is 8 0 C.Problem 2: Determine the Dewpoint Temperature using a DB reading of 140 Cand a WB r

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