Two surfaces can stick to each other {adhesion, surface}|.
Fluids have electric forces between molecules and container surfaces. Fluids that physically adhere to surface can rise in small-diameter tubes {capillary rise}|. Clinging force pulls fluid up tube sides. Fluid rises until potential-energy increase balances air pressure.
When fluids leave holes, fluid tends to flow around hole edge {Coanda effect}.
If fluid is adhesive, fluid curves up container walls {meniscus}|. If fluid is not adhesive, fluid curves down container walls.
Van der Waals forces can cause molecules to bind to surfaces {physisorption}|. Vibrations then cause molecules to leave surface, within 10^-8 seconds, heating surface. Surface chemical bonds do not form or break.
Chemical bonds between surface molecules and fluid molecules can bind molecules to surfaces chemically {chemisorption}|. Molecule stays at surface from 1 to 1000 seconds and then has desorption. Chemisorption has activation energy. At low pressure and low absorption, chemisorption fraction depends on pressure. At high pressure or for strong electrical forces, chemisorption fraction depends on pressure inverse.
Chemisorbed molecules stay at surface from 1 second to 1000 seconds and then leave {desorption, surface}|, heating surface. Surface chemical bonds break. Desorption has activation energy.
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0225