Experimental densities and derived thermodynamic properties of pure p-cymene, alpha-pinene, limonene and citral under high pressure conditions

•Density measurements of various terpenes at moderate temperatures and high pressures.•Density data were correlated applying the modified Tammann-Tait equation.•Calculation of the isothermal compressibility and the isobaric thermal expansion coefficient.•Densities of the investigated terpenes decrease: citral > α-pinene > p-cymene > limonene.•Among studied terpenes, citral is most rigid upon volume change.