Equation Icon  -ptot w-+--(1 +-2w-)ρ∕2λ-+-ρℰ∕3ρ wtot ≡ ρ = 1 + ρ∕2 λ + ρ ∕ρ , (108 ) tot [ ℰ ][ ]− 1 2 -˙ptot 2 ρ-+-p- ------4-ρℰ-------- -------4ρℰ-------- ctot ≡ ρ˙tot = cs + ρ + λ + 9(ρ + p )(1 + ρ∕λ ) 1 + 3(ρ + p)(1 + ρ ∕λ) , (109 )