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How to Play With Your Food: Science at the Dinner Table Robert Sparks National Optical Astronomy Observatory Robert Sparks National Optical Astronomy Observatory
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Pinon Teacher Workshop October 13th, 2007 Fill a clear plastic cup with a clear carbonated beverage (Sprite, Sierra Mist, Carbonated Water, etc) Drop half a dozen or so raisins into the cup and observe Fill a clear plastic cup with a clear carbonated beverage (Sprite, Sierra Mist, Carbonated Water, etc) Drop half a dozen or so raisins into the cup and observe
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Pinon Teacher Workshop October 13th, 2007 Raisins float to the surface sink to the bottom and repeat the process Carbon Dioxide bubbles attach to the raisins increasing their buoyancy enough to make them float Bubbles pop at the surface and raisins sink again Raisins float to the surface sink to the bottom and repeat the process Carbon Dioxide bubbles attach to the raisins increasing their buoyancy enough to make them float Bubbles pop at the surface and raisins sink again
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Pinon Teacher Workshop October 13th, 2007 The Atomizer! You need a cup of water and two straws Hold one straw vertical: Do not let it touch the bottom of the cup Hold the other straw horizontal over the first and blow hard! You need a cup of water and two straws Hold one straw vertical: Do not let it touch the bottom of the cup Hold the other straw horizontal over the first and blow hard!
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Pinon Teacher Workshop October 13th, 2007 The Atomizer! Bernoulli’s principle says that moving air creates low pressure above the straw Air pressure forces fluid up the straw Bernoulli’s principle says that moving air creates low pressure above the straw Air pressure forces fluid up the straw
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Pinon Teacher Workshop October 13th, 2007 Straw Through the Potato! Can you take a straw and drive it through a potato?
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Pinon Teacher Workshop October 13th, 2007 Straw Through the Potato! The trick: Put your thumb over the end of the straw Trapped air in the straw gets compressed High pressure air gives straw added strength http://www.youtube.com/ watch?v=beELbuz9_0g The trick: Put your thumb over the end of the straw Trapped air in the straw gets compressed High pressure air gives straw added strength http://www.youtube.com/ watch?v=beELbuz9_0g
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Pinon Teacher Workshop October 13th, 2007 The Finale: Mentos and Diet Coke Geyser! Do this OUTSIDE! Drop a roll of Mentos into a bottle of Diet Coke and STAND BACK! Do this OUTSIDE! Drop a roll of Mentos into a bottle of Diet Coke and STAND BACK!
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Pinon Teacher Workshop October 13th, 2007 The Finale: Mentos and Diet Coke Geyser! Gelatin and gum arabic in Mentos break surface tension of water Bubbles form on nucleation sites in Mentos Sploosh! Gelatin and gum arabic in Mentos break surface tension of water Bubbles form on nucleation sites in Mentos Sploosh!
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