Water Held by a Mesh Screen

Water can remain in the inverted cup behind the mesh. Ask students to predict what will happen. Cover cup with mesh, invert carefully, then remove support card. Key idea: Surface tension bridges the tiny openings while air pressure helps support the water. Ask: How can a screen full of holes hold water? Safety and cleanup: Plastic cup over tray; teacher demo. https://www.google.com/search?q=%22Water%20Held%20by%20a%20Mesh%20Screen%22%20science%20demonstration%20experiment