Thermophysical properties such as density (ρ), and viscosity (η) of pure components and binary mixtures of pyridine (PY) with 2-alcohols viz., 2-propanol (2-PPL), 2-butanol (2-BTL), and 2-pentanol (2-PTL) were measured over the entire range of composition of pyridine at varying temperatures T = (298.15, 303.15 and 308.15) K and at pressure 0.1 MPa. Using measured data, excess molar volume ( \({V}_\text{m}^\text{E}\) ), and viscosity variation (∆η) were derived and correlated to the Redlich–Kister (R–K) polynomial equation. Further, the apparent molar volumes ( \({V}_{\text m,\varnothing ,1}\) and \({V}_{\text m,\varnothing ,2}\) ), partial molar volumes ( \({\overline{V} }_{\text m,1}\) and \({\overline{V} }_{\text m,2}\) ), and excess partial molar volumes ( \({\overline{V} }_{\text m,1}^{\text E}\) and \({\overline{V} }_{\text m,2}^{\text E}\) ) values were also derived. These characteristics are employed to explain the emergence of new intermolecular interactions (H-bonding, packing efficiency, and OH–π interaction) between dissimilar molecules. Over the whole range of pyridine composition, the \({V}_\text{m}^\text{E}\) values showed a negative trend, while the ∆η values showed a positive trend. Furthermore, using thermodynamic results, discuss about how temperature affects molecular interactions between molecules.
