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Surface Tension of Water Find out more about water, how bubbles are formed, experiments, and the answers to trivia questions sent with the kids science project on surface tension of water. Trivia Questions1. What creature uses the surface tension of water to stalk its prey? 2. How much does soap decrease the surface tension of water? Find the answers to these kids science questions.
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Kids Science Library
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Science doesn't have to be
complicated, expensive or use specialized laboratory equipment.
There are great science projects that can be performed using common
household items.
Whether you are a parent or a student trying to find an idea for a science project, a teacher looking for ideas for the classroom, or a science enthusiast who enjoys the delight of experimentation, you'll find what you're looking for in this book. |
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First, find a piece of clear plastic that is big enough to hold easily. It could be from a plastic bag or even from some old packaging. Second, put a large water drop in the center of the plastic. The water drop will be the lens for the magnifier. Hold it about an inch (or 2 cm) over a piece of newspaper. The text you see through the water drop should look larger than the text surrounding it. The surface tension of water causes the molecules to create a rounded surface on the water drop. The rounded shape of the drop bends the light (with the image) outwards. As it spreads out, the image that you see gets larger. If the water drop is not exactly round, the image will be distorted. It will also distort when the water wiggles. As magnification increases, any distortions are also magnified. Surface tension of water makes it impossible to stretch out to create a thin film or bubble. There is a strong attraction between water molecules, preventing them from being stretched thinly enough to produce a bubble. Fortunately, soap reduces the surface tension and allows bubbles to form. A soap film always pulls in as tightly as it can, just like a stretched balloon. A soap film makes the smallest possible surface area for the volume it contains. Most bubbles are spheres because it is the shape that has the smallest surface area compared to its volume. If you want to experiment with creating bubbles, you can make your own bubble mix and bubble wands.
Websites with information on the Surface Tension of Water
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What Should Happen When you place soap solution in contact with water, soap molecules try to spread over the surface of the water, at first, since they are confined in the cavity of the boat with only one way out they jet from the rear end of the boat creating a reaction force strong enough to drive the boat across the water. As soon as all the water surface is covered with a monolayer of soap molecules, the motion stops.
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Trivia Answers 1. What uses the surface tension of water to stock its prey?
2. . How much does soap decrease the surface tension of water?
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