THERMOACOUSTIC PROPERTIES OF METHYL-ESTERS OF N-ALKANOIC ACIDS

A number of thermoacoustic parameters, including the Sharma constant S -0, the isochoric temperature coefficient of volume expansivity (d In alpha/d In T)(V), the isochoric temperature coefficient of internal pr essure (d InPi/d In T)(V), reduced I volume V, reduced compressibility beta and the Huggins parameter F, are estimated by using only the vol ume expansivity alpha from the density temperature data for a number o f methyl esters of n-alkanoic acids. The methyl esters give excellent separation of saturated fatty acid mixtures. The Sharma constant, whic h relates the molecular constant n and other thermoacoustic parameters , is a constant with a characteristic value of 1.11 + 0.01 for all the se esters.