Everything about The Sound Intensity totally explained
The
sound intensity,
I, (acoustic intensity) is defined as the
sound power Pac per unit area
A. The usual context is the noise measurement of sound
intensity in the air at a listener's location. For instantaneous
acoustic pressure pinst(
t) and
particle velocity v(
t) the average acoustic intensity during time
T is given by
» (dB-SIL),
where
Io is the reference intensity, 10
-12 W/m
2
Note 1: The term "
intensity" is used exclusively for the measurement of sound in watts per unit area.
To describe the strength of sound in terms other than strict intensity, one can use "
magnitude" "", "
amplitude", or "
level" instead.
Sound intensity isn't the same physical quantity as
sound pressure. Hearing is directly sensitive to sound pressure which is
related to sound intensity
. In stereo the level differences have been called "intensity" differences, but sound intensity is a specifically defined quantity and can't be sensed by a simple microphone, nor would it be valuable in music recording if it could.
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