Particle Velocity - Particle Velocity Level

The particle velocity level or the sound velocity level tells the ratio of a sound incidence in comparison to a reference level of 0 dB in a medium, mostly air.

It shows the ratio of the particle velocity v1 and the particle velocity v0.

The particle velocity level is:

L_v = 20\, \log_{10}\left(\frac{v_1}{v_0}\right) \mathrm{dB}

where v1 and v0 are the velocities.

The particle velocity level has the letter "Lv".

The unit of the particle velocity level is named "dB".

Notice: The dB is dimensionless.

If v0 is the standard reference particle velocity of:

v_0 = 5.0 \times 10^{-8} \mathrm{\frac{m}{s}}

we use "dB SVL". (SVL = sound velocity level).

Sound particle velocity v should not be confused with Sound velocity c.

Read more about this topic:  Particle Velocity

Famous quotes containing the words particle and/or level:

    “Standing on the bare ground,—my head bathed by the blithe air, and uplifted into infinite space,—all mean egotism vanishes. I become a transparent eye-ball; I am nothing; I see all; the currents of the Universal Being circulate through me; I am part and particle of God.”
    —Ralph Waldo Emerson (1803–1882)

    “No man loses ever on a lower level by magnanimity on a higher.”
    —Henry David Thoreau (1817–1862)