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The displacement of a water-air interface and its relaxation as a function of acoustic energy density and surface tension were analyzed both experimentally and numerically. Experimental systems were devised to observe the time evolution of the surface. A theoretical model to predict the response of the interface to acoustic excitation was also developed. It was found that the Langevin pressure due to a focused acoustic beam will cause the interface to rise to a height that is a function of thedoi:10.1121/1.407456 fatcat:he7ci4hg7vhexmnvmtos3qnl24