Viscosity and Speed of Sound Studies of Binary Liquid Mixtures of Formamide with N,N-Dimethylaniline at Different Temperatures

Nagarjuna Ayachithula, Babu Shaik*, Govinda Rao Konkyana and Kalimulla Thummaluru

Department of Physics, Koneru Lakshmaiah Education Foundation,Vaddeswaram, Guntur-522 502, India

*Corresponding authors: E-mail:


Theoretical values of speed of sound in binary liquid mixtures of fomamide with N,N-dimethylaniline have been evaluated at 303.15, 308.15 and 313.15 K. The experimentally determined values of speed of sound have been used to check the applicability of different speed of sound models of Nomoto (NOM), impedance (IMP), ideal mixing relation (IMR), Vandael and Vangeel (VDV), Junjie (JUN) and Rao's specific velocity (RAO) relation. The validity of these theories was checked by applying chi-square test (c) for goodness of fit and by calculating the average percentage error. Further viscosity data have been used to test the applicability of standard viscosity models of Hind, Grunberg and Nissan, Katti and Chaudhri, Wiki, Tamura and Kurata, after that corresponding interaction terms and standard deviation (σ) of these theories are calculated at various temperatures for the binary liquid systems. The results are interpreted in terms of molecular interaction between the components of the binary mixtures.


Speed of sound, Formamide, N,N-Dimethylaniline, Viscosity,

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