Water Dome on a Penny

Water forms a raised dome before spilling. Ask students to predict what will happen. Add drops one at a time to a penny. Key idea: Cohesion and surface tension hold the water together. Ask: How can water rise above the edge? Safety and cleanup: Wipe spills promptly. https://www.google.com/search?q=%22Water%20Dome%20on%20a%20Penny%22%20science%20demonstration%20experiment