A B S T R A C T Based on more than 80 carbons, the paper shows that immersion calorimetry into benzene,water and carbon tetrachloride can be used to assess with a good accuracy the limiting capacitance Co at low current densities in both acidic (2 M H2SO4) and aprotic (1 M tetraethyl ammonium tetrafluoroborate in acetonitrile) electrolytic solutions. The enthalpies of immersion DiH(C6H6) and D…