vis·cos·i·ty /vɪsˈkɑsətɪ/ 名詞
1. The quality or state of being viscous.
2. Physics A property possessed by a viscous fluid, being a resistance to the forces causing a fluid to flow, caused by interactions between the molecules of the fluid and between the fluid and the walls of the conduit through which it moves; also, a measure of such a property.
n : resistance of a liquid to sheer forces (and hence to flow)