Science, Tech, Math › Science Seesaw Candle Fire Magic Trick Simple Science Magic Trick Share Flipboard Email Print In this fire science trick, a lit candle bobs up and down on its own, like a seesaw. Anne Helmenstine Science Chemistry Activities for Kids Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated June 08, 2018 The seesaw candle magic trick is a fire science trick that teaches how combustion and Newton's Third Law of Motion work. A candle, balanced between a pair of glasses, rocks or seesaws up and down on its own. The motion continues as long as the candle continues to burn. If one side of the candle starts out heavier than the other, the motion of the candle will act to equalize the mass on either side of the pivot point. It's a simple trick, but eye-catching and interesting! Seesaw Candle Trick Materials Long candleNeedle2 glasses or jars that are the same height Long, thin candles work best for this trick. You can even use a pair of candles that are connected to each other. Procedure The first step is to expose wick at both ends of the candle so take a look at the bottom of the candle. If it has some wick pressed onto the bottom of the wax, loosen it so that you will be able to light it. On the other hand, if there isn't any wick at the bottom of the candle, use a knife to cut away enough of the candle to expose wick. You don't need a particularly sharp knife. In fact, it's better to use a dull knife so that you don't accidentally cut the wick.Push the needle through the candle about halfway down its length. You don't have to be exact, but if you aren't very good at gauging halfway points, then use a ruler to measure your candle, divide that number by two and push the needle through the candle at that point. If the candle wax is soft, you may be able to push the needle through the candle with minimal effort, but if the wax is hard or your candle is thick, then grasp the needle with pliers or tweezers, heat it in a flame and push it through the candle. The hot needle should pass through the wax fairly easily. The trick still works if you accidentally bend the needle.Balance the needle and candle between a pair of glasses. It is okay if one end of the candle is heavier than the other.Light both ends of the candle. The candle will rock up and down, like a seesaw. You can watch a video of the project if you'd like to see what to expect. How It Works The candle moves in response to forces acting on it, trying to reach equilibrium. The combustion reaction turns the candle wax into carbon dioxide gas and water vapor, making the burning end of a candle lighter. If one side of the candle burns more quickly than the other, the lighter side of the candle moves up. The lower side of the candle is angled such that the flame melts the wax, causing it to drip down. This not only lessens the mass at that end of the candle, but the force from the dripping wax actually pushes the end of the candle up! This is Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. More Fire and Candle Science Magic Traveling Flame Candle Magic TrickBlow Out a Candle with Chemical MagicTrick Birthday CandlesEdible Candle Trick Tips and Safety This is a fire project, so use adult supervision and avoid trying this trick near curtains, pets, gasoline... you get the picture.Lighter candles respond more dramatically to changes in mass than heavier ones. Ergo, lighter candles will give you a better range of motion than heavier candles. If you use a very big candle, you won't see much motion at all. When in doubt, lighten up! Disclaimer: Please be advised that the content provided by our website is for EDUCATIONAL PURPOSES ONLY. Fireworks and the chemicals contained within them are dangerous and should always be handled with care and used with common sense. By using this website you acknowledge that ThoughtCo., its parent About, Inc. (a/k/a Dotdash), and IAC/InterActive Corp. shall have no liability for any damages, injuries, or other legal matters caused by your use of fireworks or the knowledge or application of the information on this website. The providers of this content specifically do not condone using fireworks for disruptive, unsafe, illegal, or destructive purposes. You are responsible for following all applicable laws before using or applying the information provided on this website.