How do you calculate dry bulb temperature and wet bulb temperature to get relative humidity?

To calculate relative humidity, you first need to determine the dry bulb temperature (DBT) and the wet bulb temperature (WBT) using a psychrometer. Once you have these temperatures, you can use a psychrometric chart or a formula that incorporates both temperatures. Relative humidity (RH) can be calculated using the equation: ( RH = \frac{E}{E_s} \times 100 ), where ( E ) is the actual vapor pressure derived from the WBT and ( E_s ) is the saturation vapor pressure derived from the DBT. Alternatively, many online calculators can compute RH directly when provided with DBT and WBT.