In order to determine the concentration of solid in water using ultrasonic sensor, it is necessary to develop a correction where the concentration can be directly determined from the measured ultrasonic velocity by means of the ultrasonic sensor. From adiabatic compressibility data, ultrasonic velocities at different concentrations have been evaluated for solutions of sodium hydroxide and potassium hydroxide. Newton's Laplace equation was used to establish relation correlating ultrasonic

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... y, density and adiabatic compressibility of the solution at any concentration. It is found that ultrasonic velocity through the liquid media begins to change at very low concentration and depends on the density and adiabatic compressibility of the medium.