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Water contacts (A) Contact angle θ is measured within the liquid, and (B) can change as a drop moves, becoming asymmetric. This contact-angle hysteresis explains how raindrops stick to window panes (C). (D) Micrometer-scale roughness traps air between liquid drop and solid (the Cassie-Baxter or fakir state), producing large contact angles.
PHOTO CREDITS: (PANEL C) JUPITER IMAGES. (PANEL D) SUPERSTOCK
