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Suppose a capillary tube (a tube with a narrow inner diameter) with an inner dia

ID: 1848149 • Letter: S

Question

Suppose a capillary tube (a tube with a narrow
inner diameter) with an inner diameter of 1.0 mm
and a length of 10 cm is initially held at 20 degrees Celsius. A
continuous plug of liquid Hg 1 cm long is
contained in the center of the capillary. If the
temperature is raised to 100 degrees Celsius, determine the final length of the liquid Hg inside the capillary.
You may assume that any expansion in the radial direction is negligible.



Mercury (Hg) 234 61 x 10^-6 (thermal expansion coefficient)
0.150 (atomic radius nm)
Nickel (Ni) 1728 13 x 10^-6 (thermal expansion coefficient)
0.135 (atomic radius nm)

Explanation / Answer

This dimensionless parameter is commonly called the Capillary Number. This formula should be held at arm's length and given a vote of “No Confidence. 1.66 A thin wire ring, 3 cm in diameter, is lifted from a water surface at 20°C. is 2.3 A vertical clean glass piezometer tube has an inside diameter of 1 mm.

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