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Glossary: Relative Pressure
P/P0, where P is the absolute pressure and P0 is the saturation vapor pressure of the adsorptive at the experimental temperature. This is commonly used, for example, as the x axis on isotherm plots of N2 uptake at 77 K. At this temperature, P0 for nitrogen is 1 bar (or 0.1 MPa) and so the relative pressure is 0 – 1 in the pressure range 0 – 1 bar.