Sound has different parameters. Major parameters are sound frequency, sound intensity and sound pressure.

  • The SI unit of frequency is hertz (Hz).
  • Sound intensity is the sound power per unit area, the SI unit is Watt per square metre (W/m2).
  • Sound pressure is the difference between the pressure caused
    by a sound wave and the ambient pressure of the medium it is passing through. The SI unit of sound pressure is pascal (Pa).
  • Decibel (dB) a relative unit of measurement widely used in acoustics. However, the dB is not a unit in the sense that a metre is units of length. The decibel is a logarithmic unit used to describe a ratio between the measured level and a reference or threshold level
    of 0 dB. The ratio may be sound power, sound pressure, or sound intensity, etc.

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