Capillary Action
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State
Capillary action is a liquid's rise up a narrow tube against gravity, from adhesion to the walls outcompeting the liquid's own cohesion.
Show
A blood drop is drawn up a narrow glass tube during a fingerstick, since adhesion to the glass exceeds cohesion.
Watch for
A liquid rises only where adhesion exceeds cohesion — mercury's stronger cohesion makes it dip instead.
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