LIST OF SYMBOLS USED IN TEXT 



Surface area; A* amplitude parameters. 



B Arbitrary constant. 



b Coefficient of thermal expansion (volumetric). 



V Specific heat at constant pressure. 



a Sound speed (X / p Q ) 2. 



c* Complex sound speed. 



D Clearance between free surface and top of cavity 

 (figure 9). 



I).^. Deformation (strain) tensor (i = 1,2, 3; h = 1, 2, 3). 



E Acoustic energy (intrinsic plus kinetic). 



e Base of natural logarithms. 



F Body force. 



/ Frequency (c/s); or functional notation. 



i Integer suffix (i = 1, 2, 3). 



j Unit imaginary number. 



K Isothermal compressibility coefficient. 



K, Thermal conductivity coefficient. 



K.; Complex wave number corresponding to coordinate x . 



h Integer suffix (h = 1, 2, 3) independent of i. 



h^ Real part of wave number. 



I ^ Dimensions of rectangular cavity resonator. 



L Gross scale factor (volume /surface area). 



m Mass per unit area of flexible wall. 



n Unit normal to boundary (the components n^ being the 

 direction cosines of the boundary). 



rii Integer designating the mode of oscillation. 



