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Standard Temperature and Pressure (STP) Standard Temperature and Pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure. Do not confuse STP with the STP Products Company, a maker of oil and fuel additives...unless you are reading one of their MSDS's!
Water content is defined as the absolute humidity of the gas if it is brought to a standard pressure and temperature state. For metric units this state is normal ambient pressure (101325 Pa) and 0 Â°C. For nonmetric units (lb/MMscf) the standard temperature is 60 Â°F.t is a function only of temperature, and it indicates the maximum amount of water that can exist in the vapor state. This amount increases with increasing temperature. Vaisala Humidity Calculator uses the Wagner, Pruss pruÃ formula to calculate the water vapor saturation. pressure