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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!
And Saturation Pressure can be defined as the pressure corresponding to a temperature called saturated temperature (say T0) at which the vapour pressure of the mixture equals the atmospheric pressure. (The system is said to have reached its boiling point.) Lets, understand it from the graph above(from wiki).