Capillarity refers to the ability of a liquid to flow in narrow spaces without the assistance of external forces, like gravity. This phenomenon occurs due to the interplay between cohesive forces within the liquid and adhesive forces between the liquid and surrounding surfaces, leading to unique behaviors in porous materials and small-scale systems. Understanding capillarity is essential for analyzing various transport phenomena at the nanoscale, where these forces become significant in fluid movement through tiny channels or pores.
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