The SI unit of coefficient of viscosity is
Correct answer: A. N s per m squared
- A. N s per m squared
- B. N per m squared
- C. N m
- D. m squared per s
Explanation
Viscosity is defined through the relation between shear stress and velocity gradient, giving units of newton second per square metre, equivalently the pascal second. The pascal, newton per square metre, is pressure rather than viscosity. In the older CGS system the unit was the poise, and one pascal second equals ten poise.
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About Fluid Drag
Fluid drag is the resistive force exerted by a liquid or gas on an object moving through it, and its value depends on speed, fluid density, shape and exposed area. Questions examine drag at low and high speeds, terminal velocity when drag balances weight, and the difference between drag and ordinary solid friction.
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