Abstract
The following is an introduction to the differences between water and air as media for propagating sound. What follows and more information on underwater sound can be found in Horton (1957). The main difference between air and water as media for propagating sound lies in their characteristic impedance. This quantity
Z
is the quotient of excess or acoustic pressure and particle velocity and is equal to
ρc
where
ρ
is density and
c
is velocity of propagation. Then
Z
w
/Z
a
= (ρc)
w
/(ρc)
a
= 1000 x 1500/1.22 x 330 ≃ 3700.
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