Adsorption isotherms of CO₂ on three types of activated carbon were measured over wide temperature range, from 298^oK to 194.5^oK. The adsorption equilibria were correlated according to the Dubinin-Radushkevich equation.
The correlations for the carbons in temperature indifferent characteristic curve were yielded by the use of pressure variable density of adsorbed phase in deriving adsorption volume. The pressure variable density, which is the density of saturated liquid CO₂ under given equilibrium adsorption pressure, was determined from reduced density correlation and empirical vapor pressure function of CO₂. Density and vapor pressure of quasi-liquid state CO₂ at below the triple point were evaluated by extrapolation of the correlations.