Symbol LI, units db (decibel); noise level relative to the faintest audible sound, which is rated as 0 db. It is related to sound intensity I, units W/m2, the power per unit area of the sound wave. LI = 10 log(I/Io), where Io is taken to be 10?12 W/m2, the sound intensity corresponding to 0 db. A whisper has a typical sound intensity level of 20 db; a conversation of 50 db; a busy street of 70 db; heavy machinery of 90 db; and jet aircraft of 120 db.
| Sound measurements |
|---|
| Sound pressure p |
| Sound pressure level (SPL) |
| Particle velocity v |
| Particle velocity level (SVL) |
| (Sound velocity level) |
| Particle displacement ξ |
| Sound intensity I |
| Sound intensity level (SIL) |
| Sound power Pac |
| Sound power level (SWL) |
| Sound energy density E |
| Sound energy flux q |
| Acoustic impedance Z |
| Speed of sound c |
Sound intensity level or acoustic intensity level is a logarithmic measure of the sound intensity in comparison to the reference level of 0 dB (decibels).
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