~10^-5 - 10^-6 g/sec
||Upadhyaya A, Sheetz MP. Tension in tubulovesicular networks of Golgi and endoplasmic reticulum membranes. Biophys J. 2004 May86(5):2923-8. p.2928 left column top of paragraphPubMed ID15111408
||E.A. Evans, R.M. Hochmuth Mechanochemical properties of membranes Curr. Top. Membr. Transp., 10 (1978), pp. 1–62 doi:10.1016/S0070-2161(08)60833-3 AND P.G. Saffman Brownian motion in thin sheets of viscous fluid J. Fluid. Mech., 73 (1976), pp. 593–602 DOI: link
||P.2927 right column bottom paragraph to p.2928 left column: "Chizmadzhev et al. (1999) have calculated the velocity v of lipid transfer between fusing membranes at different tensions to be v = C(Δσ/η), where Δσ is the tension difference, η is the surface viscosity of the membrane, and C is a factor depending on the pore geometry. Making reasonable assumptions about the pore geometry and viscosity of these membranes, η = ∼10^−5−10^−6 g/s (primary sources), [investigators] find that the measured tension difference (∼0.01 dyn/cm) is sufficient to produce the observed lipid flow velocities."