Power number, also called Newton's number, is defined as

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Power number, also called Newton's number, is defined as a dimensionless parameter relating to

1. turbulent flow
2. the relative velocity between the nutrient solution and individual cells
3. energy required by the stirred reactors
4. none of the above

Correct Option: C

The power number, N_P is a commonly-used dimensionless number relating the resistance force to the intertia force. The power number has different specifications according to the field of application e.g., for stirrers, the power number is defined as :

N_P =	P	with
	ρn³d⁵

P = power
ρ = fluid density
n = rotational speed
d = diameter of stirrer