Physical Properties of Triglycerides III: Ultrasonic Sound Velocity

The ultrasonic sound velocity has been measured at 20° C and at 40° C for a number of triglycerides in the liquid state. From these data we have computed molar sound velocities according to Rao. Using published data on fatty acid methyl esters and a previously derived relation for triglycerides, an equation is given which relates the ultrasonic sound velocity of a mixture of triglycerides to its refractive index, density, and iodine value. The applicability of this relation to fatty oils is checked against a number of original fatty oils.