My Dry bulb thermometer is 20 degrees C..so what would the degrees be with a wet bulb thermometer...I know its usually lower with a wet bulb
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If the relative humidity were 100% the wet and dry bulb thermometers would read the same. For any relative humidity less than 100% the wet bulb would display a lower temperature than the dry bulb. The difference in reading depends on the relative humidity. The lower the relative humidity, the greater the difference between the two thermometers.
If you know the relative humidity, go to the calibration tables for the thermometers and find the temperature difference corresponding to that relative humidity. If you don't know the relative humidity, you can't predict the difference in reading.
You can read the two thermometers, determine the difference in the readings, go to the calibration tables, and find the relative humidity corresponding to that temperature difference.
You can find a table of wet bulb/dry bulb temperatures vs relative humidity at this website:
http://www.digitemp.com/wetbulb.shtml
That table may, or may not accurately represent the results of your thermometers.
If that table is accurate for your system, with a dry bulb reading of 20C and 67% relative humidity you should expect the wet bulb to be approximately 4C less or about 16C.
If you know the relative humidity, go to the calibration tables for the thermometers and find the temperature difference corresponding to that relative humidity. If you don't know the relative humidity, you can't predict the difference in reading.
You can read the two thermometers, determine the difference in the readings, go to the calibration tables, and find the relative humidity corresponding to that temperature difference.
You can find a table of wet bulb/dry bulb temperatures vs relative humidity at this website:
http://www.digitemp.com/wetbulb.shtml
That table may, or may not accurately represent the results of your thermometers.
If that table is accurate for your system, with a dry bulb reading of 20C and 67% relative humidity you should expect the wet bulb to be approximately 4C less or about 16C.
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If you have a regular mercury type thermometer, try this: get a short piece (about one inch) of an old shoe lace from a tennis shoe or sneaker. Wet it and slip it over the bulb of your thermometer. Fan some air across it and you have your wet bulb temperature. I know up front this doesn't answer your question directly, but it will get you the answer.
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The temperature of the wet bulb depends on the humidity. If the wet bulb is dry or if the humidity is 100% then it also reads 20 C.
You haven't really given us enough information to work with.
The temperature of the wet bulb depends on the humidity. If the wet bulb is dry or if the humidity is 100% then it also reads 20 C.
You haven't really given us enough information to work with.