This script will determine the relative humidity from the entered dry and wet bulb temperatures data.
Wet bulb dry bulb dew point.
In of mercury mm of mercury millibars hpa.
Dry bulb wet bulb and dew point temperatures.
At lower humidity the wet bulb temperature is lower than dry bulb temperature because of evaporative cooling.
The knowledge of only two of these values is enough to determine the state including the content of water vapor and the sensible and latent energy enthalpy.
Enter a temperature wet bulb and actual station pressure.
The entry required is in fahrenheit degrees.
Enter your actual station pressure not the altimeter setting.
It includes a dry bulb thermometer a wet bulb thermometer and a psychrometric chart a graph that plots the relationships between the dry and wet bulb temperature relative humidity and dew point at constant pressure.
The temperature where the two meet is the dew point temperature in c.
There is a converter below this calculator if you only know the celsius temperature for the entries required.
The following tables calculate dew point and relative humidity based on the observed wet bulb and dry bulb temperatures and the elevation at the site of the observation.
The dry bulb wet bulb and dew point temperatures are important to determine the state of humid air.
At 100 relative humidity the wet bulb temperature is equal to the air temperature dry bulb temperature.
Use the dry bulb temperature on the y axis and the difference between the wet and dry bulb on the x axis.
These can be calculated automatically using wildland fire rh calculator apps for ios and android available for free.
Find the dew point temperature by using the top chart from the resource listed below.
The dew point temperature is the air temperature that dew begins to form.
The wet bulb temperature wbt is the temperature read by a thermometer covered in water soaked cloth wet bulb thermometer over which air is passed.
Dew point and wet bulb temperatures are very important in indicating the state of the humid air.
Enter the two different temperatures.
By definition wet bulb temperature is the lowest temperature a portion of air can acquire by evaporative cooling only.