Produced water is chemically very complex. The process of producing and processing produced water causes changes in temperature and pressure. The addition of treating chemicals, along with the presence of coproduced gas, oil, and likely solids, changes the produced-water properties and behavior.
Many times, relative humidity can be misleading. For example, a temperature of 30 and a dew point of 30 will give you a relative humidity of 100%, but a temperature of 80 and a dew point of 60 produces a relative humidity of 50%. It would feel much more humid on the 80 degree day with 50% relative humidity than on the 30 degree day with a 100% relative humidity.
Relative humidity gives the ratio of how much moisture the air is holding to how much moisture it could hold at a given temperature. This can be expressed in terms of vapor pressure and saturation vapor pressure: RH = 100% x (E/Es). where, according to an approximation of the Clausius-Clapeyron equation:nd T is temperature (in Kelvin), and Td is dew point temperature (also in Kelvin). So, if you know the temperature, you can solve for Es, and substitute the equation for E into the expression for relative humidity and solve for Td (dew point).