The experiment cannot work with air in the glass, even if you seal the edges with water, because the air will simply have the same pressure as the air outside ( It does work with light cards, because of capillary force alone, but you can put small weights on the card in both cases to see a difference ).
42.
The capillary force vaporizer is new technology which offers many practical advantages for the military by burning the same fuel used to power Hum-Vees, trucks and aircraft . It was offered as a major breakthrough for backpackers as well and stoves based on the technology were supposed to become inexpensive and replace other types of stove that burned other fuels.
43.
Where \ sum P is the sum over the participating pressures, such as the atmospheric pressure P _ A, the hydrostatic pressure P _ h and the equivalent pressure due to capillary forces P _ c . \ eta is the viscosity of the liquid, and \ epsilon is the coefficient of slip, which is assumed to be 0 for wetting materials . r is the radius of the capillary.
44.
Therein ? w is density of water and V w is volume of water imbibed, ? o is density of oil and V o is volume of oil imbibed, the amount of water imbibed and amount of oil imbibed under gravity are same; and air behaves as a strong non-wetting phase in both an oil / air / solid and a water / air / solid systems, thereby indicating that both oil and water behave as strong wetting phases, resulting in equal air / oil and air / water capillary forces for the same porous media and for a given pore size distribution.
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