점도
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정의
유체의 변형 또는 흐름에 대한 저항으로, 유체 층 사이의 내부 마찰을 정량화하며, 동적 점도는 Pa·s 또는 cP로 측정한다.
설명
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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