State the Newton's law of viscosity. Explain the i

Question

State the Newton's law of viscosity. Explain the importance of viscosity in fluid motion. What is the effect of temperature on viscosity of water and that of air.

24 Feb 2025

Answer :

Word Count : 266

Newton's law of viscosity states that the shear stress (\(\tau\)) in a fluid is directly proportional to the rate of shear strain (\(\frac{du}{dy}\)) or velocity gradient. Mathematically, it is expressed as:

\[
\tau = \mu \frac{du}{dy}
\]

where:
\(\tau\) = shear stress (N/m²)
\(\mu\) = dynamic ____ _________ _________ ______ ____ _____ _____ __________ __________ _____ ______.
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