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sci.acoustic-impedance Calculator
Calculates the acoustic impedance Z = ρc of a medium and the transmission/reflection coefficients at interfaces between media. Impedance mismatch between air (415 Pa·s/m) and water (1.5 × 10⁶ Pa·s/m) reflects 99.9% of sound — diagnostic ultrasound gel eliminates this mismatch at the skin.
Inputs
Density Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Sound Speed M S
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Results
acoustic impedance Z (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.
reflection loss vs air (dB)
The decrease or degradation from the baseline.
Z = ρ·c
Reference formula or conversion factor shown for context.
water Z
The value at the specified point or condition.
impedance mismatch
Total opposition to AC current (Ω), combining resistance and reactance. Z = √(R² + X²). Maximum power transfer occurs when source and load impedances match.