Relative difference between and . We may distinguish two regimes: for 0 < R_c < 0.661   R_p the fluid envelope increases the tidal dissipation; above this value, tidal dissipation is lower than it would have been without a fluid shell. Parameters are given in Tables 5–7 for a Saturn-like planet perturbed at the tidal frequency of Enceladus (ω = 2.25    ×    10^-4   rad   s^-1): , , , , G = 5 × 10¹⁰(Pa), and η = 10¹⁵   (Pa   s).