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.
Resistance vessels play an important role in the regulation of local blood flow and capillary pressure (Figure 2). Poiseuilleâs equation tells us that resistance is governed by the fourth power of the radius of the vessel, so small changes in radius have a profound effect on flow.