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)

    “There are old heads in the world who cannot help me by their example or advice to live worthily and satisfactorily to myself; but I believe that it is in my power to elevate myself this very hour above the common level of my life.”
    —Henry David Thoreau (1817–1862)