Velocity of sound

Gives the velocity of sound and the unit.

Two units may be chosen:

The velocity of sound is used to compute the x-axis unit if Distance [meter] or Distance [feet] is chosen for the time domain plot types. It is also used to compute the quarter, half and whole wavelengths displayed in the Status Toolbar for the frequency domain plot types.

If you are performing vibrational measurements, e.g. using an accelerometer instead of a microphone, it is the velocity of propagation in the structure that is to be typed. It is named velocity of sound because most users will measure with a microphone.

Note that changing the velocity of sound in this dialog box will also affect the other time domain plot types, such as energy-time-curve.

The speed of sound, denoted c, may be found if the temperature is known using the formula

c = (331.4 + 0.6*T)

where T is the temperature in centigrade.