ρ = density of liquid (lb/ft 3 , kg/m 3 )
g = acceleration of gravity (32.174 ft/s 2 , 9.81 m/s 2 )
r = radius of tube (ft, m)
Surface tension is typically measured in dynes /cm or N/m .
|Liquid||Surface Tension |
- σ -
|Water 20 o C||0.0728||72.75|
|Water 100 o C||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 o C with density 1000 kg/m 3 can be calculated as
h = 2 (0.0728 N/m) cos(0) / ((1000 kg/m 3 ) (9.81 m/s 2 ) (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 o C (68 o F) :
The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
Surface tension of liquids like water, mercury, oils and more.
Surface tension of water in contact with air for temperatures ranging 0 to 100 degC (32 to 212 degF) - in imperial units (BG units) and SI units.
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