The uncertainty budget of these results is explained in table 8,where the contributions to the uncertainty in the speed of sound measurements are detailed and quantified. The speeds of sound allow to calculate mixture isochoric and isobaric heat capacities as perfect gas( Cv 0 and Cp0), or in other words when pressure is null; also at zero pressure, the speed of sound (u0); the adiabatic coefficient (cpg)and the acoustic virial parameters (ba and ca ). Those results are shown in
table 9 for the 5% CO mixture and in table 10