Magic Milk Surface Tension Experiment . This holds the surface molecules together and holds the water in place over the coin, stopping water spillage for much longer than you would expect. ... We could not get the coins to float. Can you pull the water all the way to the end of the row of coins without breaking the tension? You can demonstrate concepts such as surface tension, buoyancy, and even eddy currents with Japanese yen coins! There are two properties at work in this experiment: cohesion and surface tension. More on variables here Can a surface tension experiment result in some cool action art? Surface tension and cohesion is the reason you can get so many drops of water on a penny. They are attracted to one another, and the force of attraction creates surface tension. Frugal Fun for Boys has a great surface tension investigation using a coin and different liquids! Now, add the coins one at a time to the glass of water, dropping them in rim-first (not face down). The higher the surface tension of the water, the bigger a droplet you can make before it breaks and flows over the edges of the penny. Some preschoolers may want to understand the magic behind this simple science with coins. Surface tension is a special term we use to describe the cohesion between water molecules. That magic is the surface tension of water. This means you need to reduce the surface tension of water. These experiments can be performed easily anywhere with simple materials. More Surface Tension Experiments for kids. To make it easier, place a small piece of the paper towel on the water first, and then place the needle on the paper towel. What's Going On? Water molecules love to stick together! Guess how many coins you can add to the glass before the water starts to overflow! Drop food coloring onto the milk in various spots. Add water around a coin on a plate. Things that reduce surface tension are called surfactants. Fill the dish with milk. (*Whole milk works best due to its higher fat content. 10-12 coins of the same size Method: 1. Cohesion is the “stickiness” of like molecules to one another. You can use washing up liquid’s power of disrupting the surface tension of water to race lolly sticks. by: Ron Perkins. Surface tension is the result of all the water molecules sticking together. Because of surface tension, liquid surfaces act like a kind of ‘skin’, able to support small insects and materials on their surface. Water and Surface Tension. Surface tension experiments can be a fun way to learn about the unique properties of water. In this case, the like molecules are the H20 molecules in the water drops. Surface Tension: Even though aluminum has a density of 2.7 gm/cm 3, and the density of water is 1 g/cm 3, aluminum yen coins can float on the surface … Squeeze or pour a small amount of dish soap into a small bowl. Cohesion is the attraction of like molecules to one another. Who knew that a single coin could be used for so many classroom science activities! In this project, you will put droplets of water on a penny, like in Figure 1. When we fill the glass with water, we notice right away that it can go over the brim of the glass without spilling. Next try the classic surface tension experiment of floating a sewing needle on top of the water. Variables to test. The surface tension was not strong enough. Use a toothpick to pull water from the first coin to the second coin. MOBILE, Ala. (WKRG) – In today’s Science Corner experiment, see how surface tension works in two different experiments! However, 1% or 2% milk will work in a pinch.) One using a penny and the other using dish soap to propel a cardboard boat! Water molecules like to stick together. You’ll notice that the water hangs slightly over the top of the glass but doesn’t spill out just yet. Fill a clear glass with water all the way to the brim. 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