Measured a higher adsorbate density than in the gas phase! Introduction to adsorption isotherms.
A graph that measures the changes in pressure and adsorption amount while keeping the material at a constant temperature is called an "adsorption isotherm." Generally, the horizontal axis represents the relative pressure (P/P0), which is the equilibrium pressure divided by the saturation vapor pressure, taking values from 0 to 1. At P/P0 < 1, it indicates that the adsorbed gas condenses within the sample tube, meaning that the adsorption isotherm begins to show the interaction forces between the solid and the adsorbed molecules at pressures lower than the saturation vapor pressure, leading to adsorption and condensation, and it measures a higher adsorption density than in the gas phase. Additionally, in the constant volume method, the amount of adsorption is typically expressed in V/ml (STP) g-1, representing the volume of gas at standard conditions (0 °C, 1 atm). *For more details, please refer to the related links or feel free to contact us.*
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