Viscosity of Water

水的粘度

The viscosity of water measures its resistance to flow and is critical to its many functions. The low viscosity of water is important in its role as the solvent for life's chemical reactions and for blood circulation. The viscosity of water has been studied thoroughly because of the precision with which water flow must be controlled in many industrial applications.

水的粘度测量其流动的阻力，并对其许多功能至关重要。水的低粘度对于其作为生命化学反应的溶剂以及血液循环的作用都很重要。由于在许多工业应用中对水流动的控制要求很高，因此水的粘度已被深入研究。

Viscosity of liquids is expressed in a variety of units:

液体的粘度可以用多种单位来表示：

with the standard SI unit being the Pascal second or Poiseuille. That unit does not prove to be convenient for many uses, but note that the viscosity of water at 20°C is almost exactly 1 if expressed in centipoise or milli-Pascal seconds. So like its convenient density of 1 gm/cm³, water at 20°C provides a convenient comparison standard for viscosity.

以帕斯卡秒或泊为标准SI单位。这个单位在许多应用中并不方便，但请注意，水在20°C时的粘度几乎正好是1，如果以厘泊或毫帕秒为单位来表示。因此，就像其方便的密度1 gm/cm³一样，20°C时的水也提供了粘度的方便比较标准。

References:

参考文献：

Brookfield Engineering

Brookfield 工程

Engineering Toolbox

Engineering Toolbox（专名或术语）

Viscopedia

Table of water viscosity

水的粘度表

Table of common viscosities

常见粘度表