Fluid Mechanics
Choose the set of pressure intensities that are equivalent.

10 psi, 19.7 ft. of water, 5.3 inches of Hg
10 psi, 19.7 ft. of water, 23.3 inches of Hg
4.33 psi, 10 ft. of water, 8.83 inches of Hg
4.33 psi, 10 ft. of water, 20.7 inches of Hg

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Fluid Mechanics
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

All of these
Relative roughness
Friction co-efficient for flows at equal Reynold number
Absolute roughness

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