C=59∗(F−32){\displaystyle C={\frac {5}{9}}*(F-32)} (C){\displaystyle (C)} = Celsius temperature,(F){\displaystyle (F)} = Fahrenheit temperature, (T){\displaystyle (T)}= Air temperature ,and (Td){\displaystyle (T_{d})}= Dew point temperature For example, if the temperature is 100°F, you would first subtract 32 from 100, which would give you 68. Then, you would multiply 68 by 5/9, which would give you the temperature of 37. 778°C. If you live outside the United States and use the Celsius scale, you can, of course, skip this step. You can also use online temperature converters to simplify this step.
es=6. 11∗10(7. 5∗T237. 3+T){\displaystyle e_{s}=6. 1110({\frac {7. 5T}{237. 3+T}})} (es){\displaystyle (e_{s})} = standard vapor pressure and (T){\displaystyle (T)} = air temperature
e=6. 11∗10(7. 5∗Td237. 3+Td){\displaystyle e=6. 1110({\frac {7. 5Td}{237. 3+Td}})} (e){\displaystyle (e)} = actual vapor pressure and (Td){\displaystyle (Td)} = dew point You can find the dew point by checking the weather page of your local newspaper or a website that publishes weather information for your local area, such as weather. gov. [5] X Research source
rh=ees∗100{\displaystyle rh={\frac {e}{e_{s}}}*100} (rh){\displaystyle (rh)} = relative humidity, (e){\displaystyle (e)} = actual vapor pressure, and (es){\displaystyle (e_{s})} = standard vapor pressure.
The National Weather Service’s relative humidity calculator is one you can use: https://www. wpc. ncep. noaa. gov/html/dewrh. shtml
You should be able to find plastic student thermometers at most office supply stores and some major retailers.
A section of hollow shoelace, for example, would work. Simply slit the shoelace down the middle to create a single layer of cloth.
The thermometer without a wet cloth will be your dry-bulb thermometer.
You can use another type of plastic spacer if it’s about the same size.
Be sure to wear safety glasses during this step.
Read the temperature from the wet-bulb thermometer first for an accurate reading. Mark down which temperature reading is from the wet-bulb thermometer and which is from the dry-bulb thermometer.
Whirling the thermometer causes moisture from the wet cloth to evaporate. The process of evaporation removes heat from the environment, leading to a lower temperature reading on the wet-bulb thermometer. More evaporation takes place when the air is dry because dry air has a higher capacity than moist air to absorb additional moisture.
While this method will not give you a 100% accurate reading of relative humidity, it will give you an approximate measurement of how much water vapor there is in the air.
