Table 4 Subscripts

A

air column resonance

af

air flow

a

aperture, air column, air

b

bubble

be

equivalent bubble

c

critical

d

deformation

H

Helmholtz resonance

i

inviscid

l

liquid

N

N-wave

p

particle, peak

r

relative, radiation, relaxation

V

film vibration

v

viscid

vt

visco-thermal

y

yield