What is Sensitivity in an ultrasonic transducer Specification?
The sensitivity of a microphone can certainly be written as so-many dBV/Pa or so-many dBV/uBar so maybe you have one too many "/" in your data sheet.

For instance 0 dBV is precisely 1 V RMS and -25dBV is 56.2mV RMS so this hopefully answers the first part of the formula.

Sound pressure level is usually quoted in dB but when it comes to specifying microphone sensitivities pascals or Bars are used as representative of the RMS pressure.

For instance an SPL of 94 dB is 1 pascal and 1 pascal also equals 0.00001 bar. 1 uBar is therefore 0.1 pascals. Remember these are RMS values of sound pressures.



EDITED above because wrong mV stated for -25dBV