hypodermic needles come come in various diameters referred to as the the Gauge (

Question

hypodermic needles come come in various diameters referred to as the the Gauge (g), of the needle, a 16 g hypodermic needle has a nominal inner wall diameter of 1.65 mm and a 30 g hypodermic needle has a nominal inner wall diameter of 0.311 mm. Assuming laminar flow through a needle 1 inch in length, if you need to inject 3 cubic centimeters (cc) of medicine into a patient in 15 seconds, what is the pressure difference for the case of 16g needle as compared to a 30 g needle ? ( Assume viscosity of the medicine as the same as the viscosity of the water at room temperature) (i dont know if im supposed to use this equation Q = (pi ( change of p) / 8 * eta L ) r^4

Explanation / Answer

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