Viscosity Measure of the resistance to flow, or internal friction, of a fluid. Viscosity changes with temperature so the temperature at which the measurement was made must always be specified.

• 运动粘度表明一种流体抵抗流动或者说是内部摩擦的能力的度量值。运动粘度会随温度变化而变化，因此，在给出运动粘度的数值时，通常必须注明其测试温度。