In this experiment, we'll learn about something called capillary action. Capillary action is fascinating because it allows liquid to move by itself––against gravity!
Capillary action occurs because water has strong cohesive and adhesive properties, meaning that it likes to stick to itself and to other objects. In celery and other plants, water moves from the roots to the leaves through capillary action in small tubes throughout the plant's tissues, called xylem.
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