The relationship between pressure, flow, and resistance for a liquid flowing through a tube repre-sents:
a. Reynolds' number. c. Venturi principle.
b. Poiseuille's law. d. Bernoulli principle.
ANS: B
When considering the flow of a liquid through a tube, you should take two factors into consider-ation: the driving pressure forcing the fluid and the resistance the liquid must overcome as it flows. Reynolds suggested that fluid flow becomes turbulent when velocity is increased or when there are changes in fluid density or viscosity and the radius of the tube. The Venturi and Ber-noulli principles deal with the relationship between a liquid's forward velocity and tubular lat-eral-wall pressure.
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