Where P is the entered ambient pressure and P w is the water vapor pressure. Pressure of dry air (P d): P d = P − P w.Where P w is water vapor pressure, RH is relative humidity (%), P ws is saturated water vapor pressure. Water vapor pressure (P w): P w = RH × P ws ⁄ 100.Where P is ambient pressure, P ws is saturated water vapor pressure. Saturated mixing ratio (W s): W s, g/kg = 621.97 × P ws ⁄ (P − P ws).Note: Replace 621.97 with 4354 to calculate the ratio in grains per pound (gr/lb or GPP). Where P w is water vapor pressure, P is ambient pressure. Where T is ambient temperature in ☌elsius, W is mixing ratio (mass of water vapor ⁄ mass of dry air) in g/kg. Where T is the ambient temperature in ☌elsius, RH is relative humidity (%), A 1 = 17.625, B 1 = 243.04☌. Dewpoint or dew point temperature (T d).This formula is derived from Ideal gas law, and adapted for water vapor. Where P w is the water vapor pressure, T is ambient temperature in Kelvin, R w is specific gas constant for water vapor and it is equal to 461.5. Absolute humidity (AH): AH, kg/m³ = P w ⁄ (R w × T).The attributes include mass of water vapor per mass of dry air mixing ratio, enthalpy, water vapor volume and mass as compared to dry and wet air in parts per million, dew point and wet-bulb temperatures, absolute humidity, water vapor and vapor saturation pressures at ambient and wet-bulb temperatures, the density of air and energy per unit volume. The calculator computes numerous humidity attributes using relative humidity (RH), ambient temperature and pressure.
Humidity is defined as the amount of water vapor in the air.The tool below helps convert between Dew Point, Volume Concentration and Relative Humidity. These 3 ways of indicating Moisture quantities in a gas sample are linked together by well established formulas. It is particularly important to differentiate Volume Concentration and Relative Humidity: a Relative Humidity of 32% corresponds to a Moisture volume concentration of 1%. a RH of 25% means that the gas could hold 4 time more water vapor at this temperature without condensation. Relative Humidity (RH) is the proportion of water vapor, compared with the maximum water vapor which could be held in the gas sample at a given temperature and pressure.It is expressed in %v or ppmv (1%v = 10 000 ppmv). Moisture Volume Concentration (ppm) is the proportion of Water Vapor within the gas sample.
This temperature can be expressed in degree Celsius (☌), degree Fahrenheit (☏) or Kelvin (K).
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