Average Mach number (star symbols), and intensity of tidal (circles) and shear (triangles) forces in gas density bins, normalized to that in the f_gas = 40% case. Empty symbols denote the forces normalized to the local self-gravity. All quantities are measured at a scale of 120 pc. Symbols have been slightly offset horizontally for clarity. The approximate distinctions between three different media are identified at the bottom, for reference. The two most gas-rich cases (red) yield comparable values at all densities for all these quantities, significantly higher than in the low gas fraction galaxy (blue).