Calculates acoustic impedance Z = ρc of a medium and normal-incidence reflection and transmission coefficients at an interface. Impedance of air: Z ≈ 415 Pa·s/m; water: 1.48 × 10⁶ Pa·s/m — the extreme mismatch means 99.9% of sound energy reflects at a flat air-water surface.
Inputs
Rho1 Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
C1 M S
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Rho2 Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
C2 M S
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Results
acoustic impedance Z₁ (Pa·s/m)
Total opposition to AC current (Ω), combining resistance and reactance. Z = √(R² + X²). Maximum power transfer occurs when source and load impedances match.
acoustic impedance Z₂ (Pa·s/m)
Total opposition to AC current (Ω), combining resistance and reactance. Z = √(R² + X²). Maximum power transfer occurs when source and load impedances match.
pressure reflection coefficient R
Sample size or count used in the calculation.
transmission coefficient T
Sample size or count used in the calculation.
transmission loss TL (dB)
The decrease or degradation from the baseline.
R = [(Z₂−Z₁)/(Z₂+Z₁)]²
Reference formula or conversion factor shown for context.