How Do You Measure & Record Temperature & Humidity?
You can measure temperature and relative humidity simultaneously using a meteorological instrument called a “sling psychrometer.” You would use its two thermometers to compare the actual temperature with the temperature if the water vapor in the air was at its condensation point. Tables derived from controlled lab conditions enable you to convert the two values into relative humidity. Dampen the little piece of cloth covering the mercury-filled bulb of the wet-bulb thermometer on the sling psychrometer with water. Grab the psychrometer’s handle and swing the two thermometers around for about five minutes. This gives time for the moisture to evaporate off the cloth, leaving behind cooler water molecules and a lower temperature reading. Use the psychrometer’s built-in slide scale to calculate the relative humidity from the wet- and dry-bulb readings. If your psychrometer doesn’t have a built-in slide or calculator, then consult an online calculator or table. Record the temperature and re
