Table I.

Physicochemical properties of selected monoterpenoids at 25°C

PropertyLinalool1,8-CineoleTrans-β-Ocimened-Limonene
Diffusion coefficient in air (D A, m2s−1)5.17  × 10−6 5.46  × 10−6 5.46  × 10−6 5.64  × 10−6
Diffusion coefficient in water (D W, m2s−1)6.26  × 10−10 6.64  × 10−10 6.52  × 10−10 6.82  × 10−10
Saturated vapor pressure (P V, Pa)21.3 253 197  253
Water solubility (δ, mol m−3)10.2  19.1   0.0797   0.0886
Henry's law constant (H; Pa m3mol−1) 2.078 13.273330 2850
Log[octanol-water partition coefficient (K o/w, mol mol−1)] 2.97  2.61   4.45  4.485
Gas-phase internal conductance (G ias, m s−1)1.59  × 10−3 1.67  × 10−3 1.68  × 10−3 1.73  × 10−3
Liquid-phase internal conductance (G L, m s−1)5.88  × 10−4 3.46  × 10−4 1.54  × 10−3 1.61  × 10−3

Supplemental data of derivation of and references to the physicochemical monoterpene characteristics and internal diffusion conductances are provided at www.plantphysiol.org. Averages were calculated whenever multiple estimates were available.