<P> provided that there is no interaction between the components . </P> <P> Knowing the relation between excess volumes and activity coefficients of the components, one can determine the activity coefficients . </P> <Dl> <Dd> V E _̄ i = R T ∂ (l n (γ i)) ∂ P (\ displaystyle (\ overline (V ^ (E))) _ (i) = RT (\ frac (\ partial \ left (ln (\ gamma _ (i)) \ right)) (\ partial P))) </Dd> </Dl> <Dd> V E _̄ i = R T ∂ (l n (γ i)) ∂ P (\ displaystyle (\ overline (V ^ (E))) _ (i) = RT (\ frac (\ partial \ left (ln (\ gamma _ (i)) \ right)) (\ partial P))) </Dd>

The density of a solid object is defined as the ratio of the mass of the object to its volume