All acoustic impedances are ratios of force to velocity

Evidence

If there are no surfaces or reflections of any sort, the specific acoustical impedance is an intrinsic property of the medium, given by the product of the density of the medium ρ0 and the speed of sound in it c; z = ρ0c. — Eric J. Heller, Why You Hear What You Hear- An…, 102 (#qualifies, via linked claim)

If the force is applied slowly, acceleration is weak. The force is then usually governed by compressibility or springiness, which therefore gives stiffness-dominated impedance. If a force is applied suddenly, the object hardly has time to move and sense its stiffness, but the mass of the object is felt immediately; the impedance is mass dominated. — Eric J. Heller, Why You Hear What You Hear- An…, 86 (#contradicts, via linked claim)

Categorization

• XREF: connects to: Impedance equals applied force divided by attained velocity; Impedance can be measured by controlling force or controlling speed, with equal results; A medium’s intrinsic acoustic impedance equals density times sound speed — Eric J. Heller, Why You Hear What You Hear- An…, 102 (+9 more)

Related

• Impedance equals applied force divided by attained velocity (similarity 0.96)
• A medium’s intrinsic acoustic impedance equals density times sound speed (similarity 0.92)
• Medium density and elasticity shape the pressure-velocity amplitude relation (similarity 0.88)
• Air transmits sound efficiently because adjacent air cells are impedance matched (similarity 0.88)
• Impedance is the ratio of force to velocity (similarity 0.87)
• Mass dominates impedance at high frequencies, stiffness at low frequencies (similarity 0.87)
• Acoustic refraction parallels optical refraction via material-dependent wave speed (similarity 0.85)
• A medium’s density and elasticity relate sound pressure to particle velocity. (similarity 0.84)
• Pressure is scalar while velocity gives a sound wave its direction (similarity 0.83)
• Impedance is force divided by velocity and measures a body’s response to force. (similarity 0.82)
• Velocity response is the convenient quantity for impulse power (similarity 0.82)
• Hard boundaries reflect sound because pressure energy cannot cross a zero-velocity point. (similarity 0.82)
• Mass, stiffness, and friction each resist a distinct kinematic quantity (similarity 0.82)
• Slow forcing gives stiffness-dominated impedance; sudden forcing gives mass-dominated impedance (similarity 0.81)
• High-frequency forcing is resisted by mass while low-frequency forcing is resisted by spring stiffness (similarity 0.81)

Broader Connections

• A medium’s intrinsic acoustic impedance equals density times sound speed #qualifies (0.90) — Eric J. Heller, Why You Hear What You Hear- An…, 102
• Sound pressure and intensity relate through air impedance of roughly 415 rayls #exemplifies (0.80)
• Mass dominates impedance at high frequencies, stiffness at low frequencies #contradicts (0.80) — Eric J. Heller, Why You Hear What You Hear- An…, 87
• Acoustic impedance mismatch determines both reflection phase and magnitude #expands (0.80)
• Slow forcing gives stiffness-dominated impedance; sudden forcing gives mass-dominated impedance #contradicts (0.80) — Eric J. Heller, Why You Hear What You Hear- An…, 86
• Sound pressure and particle velocity components are always in phase #complicates (0.75)
• A sound wave’s pressure component arises from the force driving molecular displacement. #exemplifies (0.75)
• Air transmits sound efficiently because adjacent air cells are impedance matched #exemplifies (0.70)
• Pressure is scalar while velocity gives a sound wave its direction #expands (0.70) — David Howard, Jamie Angus, coustics and Psychoacoustics, 146