The resistance to flow of a fluid through a tube can be computed according to which of the fol-lowing formulas?
a. Resistance = flow ? viscosity
b. Resistance = flow ÷ pressure
c. Resistance = pressure ÷ flow
d. Resistance = flow ? pressure
ANS: C
For any given tube length, flow resistance equals the difference in pressure between the two points along the tube divided by the actual flow. This is expressed as a formula:
R = (P1 − P2) ÷ V
Health Professions
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