  Densities, $\rho$, and speeds of sound, $u$, of 2-propanone + aniline, +
N-methylaniline, or + pyridine systems have been measured at (293.15, 298.15
and 303.15) K and atmospheric pressure using a vibrating tube densimeter and
sound analyser Anton Paar model DSA-5000. The $\rho$ and $u$ values were used
to calculate excess molar volumes, $V^{E}$, and the excess functions at 298.15
K for the speed of sound, $u^{E}$, the thermal expansion coefficient,
$\alpha_{p}^{E}$, and for the isentropic compressibility, $\kappa_{S}^{E}$ at
298.15 K. $V^{E}$ and $\kappa_{S}^{E}$ are both negative magnitudes and
increase in the same sequence: aniline < N-methylaniline < pyridine. The
$V^{E}$ and $\kappa_{S}^{E}$ curves are shifted towards higher mole fractions
of 2-propanone. The data haven interpreted assuming strong acetone-amine
interactions, and weak structural effects.
