Phase Transition Studies of Liquid Crystals Using Ultrasonic Velocities

In this study, ultrasonic velocities $({\mathbf{\dot U}})$ and specific volume $({\mathbf{\dot V}})$ of plant originated oils and fats were determined at seven different temperatures. A microcontroller-based ultrasonic interferometer is used to measure ultrasonic velocities at 3MHz. The adiabatic compressibility (B
ad
), "molar sound velocity" (R
m
), "molar compressibility" (β), Vander Waal's constant ${\text{(}}{\mathbf{\dot b}}{\text{)}}$, and "intermolecular free length" (L
f
) are all analysed acoustic characteristics. The relationship between these parameters and temperature is investigated, with the results presented graphically.