粘度
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定义
流体抵抗变形或流动的能力，量化流体层间的内摩擦；动力粘度以帕斯卡秒（Pa·s）或厘泊（cP）为单位。
解释
Water at 20°C has a dynamic viscosity of about 1 cP; honey is roughly 2,000–10,000 cP; glass is sometimes cited humorously as extremely viscous, though it is actually an amorphous solid. Viscosity decreases with temperature in liquids (engine oil thins when hot), which is why multi-grade motor oils (e.g., 10W-40) are formulated to maintain consistent viscosity across temperature ranges.
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