6.79  mobility. Analogous mobilities are defined as the ratios of the following complex amplitudes:

  • mechanical mobility              ZM =velocity across/force through;
  • rotational mobility    ZR =angular velocity across/torque through;
  • acoustic mobility      ZA =volume velocity across/sound pressure through;
  • electric impedance Z =voltage across/current through.
  • The real part of each mobility is called responsiveness and the imaginary part the excitability. The reciprocal on any mobility is an immobility whose real part is unresponsiveness and imaginary part is unexcitability.
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