V E is negative for all the mixtures studied over the whole concentration range and for all temperatures. Excess molar volumes V E of ethanol with heptane were measured at 298.15 K and 0.1 MPa, 20 MPa, and 60 MPa. V E is positive in all mixtures studied. Results were correlated by polynomial equations of the type V E) x 1 x 2 ∑ i A i (2x 1 -1) i .
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