âºâº Definition: Second. A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 (approximately 7.710-7) of a circle.
The resistance of a liquid to flowing is its viscosity.   Viscosity is a property arising from friction between  neighboring particles in a fluid that are moving at dif â¦ ferent  velocities. In liquids, it could be considered the thickness.
water uptake when the dominating flow path through the root cylinder is from cell-. to-cell (Knipfer and Fricke 2010, 2011). The rate of water flow (Q) through the root depends on the effective surface area. for water uptake (A) and the biophysical force that drives the flow (i.e., water poten-. tial difference, Î´Ï). By definition, a hydraulic conductance L (=Q/Î´Ï) is depen-. dent on root surface area (Fig. 2).