What do water striders and concrete cracking have in common?
Why does the surface of the water in a glass curl up at the edges and form a meniscus? The truth is, the water wants to escape but is held back by gravity. In a small diameter glass tube, the water will rise much higher because there is less water and gravity does not exert such an influence. The water has little attraction to the air above it and the effect is known as capillary attraction.