Refractive indices (nD ) of binary mixture containing palm biodiesel (P) and alkanols (1-pentanol (1P) and 3-pentanol (3P)) were measured at different temperatures (298.15,303.15k,308.15k,313.15k,318.15k) at 0.1 MPa over the entire composition range of mole fractions. The nD values of pure compounds and their binary mixtures were measured by using refractometer (Anton Paar Abbemat 200). Experimental data of nD were used to compute deviation in refractive index (Δn). Further, refractive index values also have been measured in terms of different mixing rules like Lorentz-Lorentz (L.L), Gladstone-Dale (G.D), Heller-relation (H.R) and Weiner-relation (W.R). The experimental data of nD compared well with the values obtained by using mixing rules for binary mixture P (1) + Alkanols (2). The measured data were correlated by Redlich-Kister polynomial equation. The effect of temperature has also been investigated.

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