|
Sound
pressure is
sound force per unit area, and is usually measured in micropascals
(µPa), where 1 Pa is the pressure resulting from
a force of one newton exerted over an area of one square meter.
The instantaneous pressure p(t) that a vibrating object exerts
on an area is directly proportional to the vibrating object's
velocity and the acoustic impedance (rc):
p(t)
= rcu
where
r = density
c
= sound speed
u
= particle velocity
Pressure
can also be defined in terms of force:
p
= F/A
where
p = pressure, F = force, and A = area
|
