ρ = density of liquid (lb/ft3, kg/m3)
g = acceleration of gravity (32.174 ft/s2, 9.81 m/s2)
r = radius of tube (ft, m)
Surface tension is typically measured in dynes/cm or N/m.
- σ -
|Water 100oC||0.0599|| |
Capillarity, like surface tension, decreases with increasing temperature. The temperature variation, however, is small and insignificant in most problems.
The capillarity rise in a clean tube (θ = 0) with diameter 2 mm and water temperature 20 oC with density 1000 kg/m3 can be calculated as
h = 2 (0.0728 N/m) cos(0) / ((1000 kg/m3) (9.81 m/s2) (2 10-3 m))
= 0.0074 m
= 7.4 mm
Capillarity rise in clean circular glass tubes for distilled water, fresh water and mercury at temperature 20 oC (68 oF):
The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
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