# How To Calculate Relative Humidity From Wet Bulb Temperature

**Finally, calculate the wet bulb.**

**How to calculate relative humidity from wet bulb temperature**. Calculate relative humidity from psychrometric chart example We now have a dry bulb and a wet bulb temperature which we can use to calculate relative humidity. Absolute temp = celcius + 273.15;

When use, place the thermometer is apart from the ground 1 first. If so, we’d simply divide that by the saturation vapor pressure at the air temperature. Some of humidity curves parts are highlighted(red) in the figure.

For example, if we have a dry bulb temperature of 20℃ and a wet bulb temperature of 15℃ what is the relative humidity? [14.1] p = p w − 0.00066 p ( t a − t w ) ( 1 + 0.0115 t w ) where p is the vapour pressure of water vapour, pw is the saturated vapour pressure of water vapour at the wet bulb temperature, p the ambient pressure. Draw the line of 25 0 c of wet bulb temperature axis (2).

Wet bulb temperature, dry bulb temperature, and station level pressure. Given the wet bulb temperature, dry bulb temperature and ambient pressure, the humidity of the air can be calculated as follows:. This humidity is measure as a %.

How to use relative humidity dry wet bulb? Where u = relative humidity (%), t = dry bulb temperature (°c), tw = wet bulb temperature (°c), p = station level pressure (hpa) More commonly we use the e a and the saturation vapor pressure at the air temperature to calculate the vapor deficit.

Those two lines intercept at one point (3). If the air is fully saturated (100% relative humidity) the water cannot evaporate, so both the wet and dry bulb temperatures are the same. The easiest way to do this is entering the dry and wet bulb temperatures into the calculator above and then click calculate.