PURPOSE: To demonstrate surface tension in capillary tubes.
DESCRIPTION: Four glass tubes of different diameter are connected at the base. The height of the water in each tube is determined by the effects of surface tension. The water is spiked with green food coloring to enhance its visibility.
REFERENCES: (PIRA 2A20.10) See Demonstration Reference File for articles on capillary effects.
EQUIPMENT: Capillary tubes with green water, TV camera.
SETUP TIME: 10 min.
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