1. How to Play With Your Food: Science at the Dinner Table Robert Sparks National Optical Astronomy Observatory Robert Sparks National Optical Astronomy Observatory

2. 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

3. 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

4. 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!

5. 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

6. Pinon Teacher Workshop October 13th, 2007 Straw Through the Potato!  Can you take a straw and drive it through a potato?

7. 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

8. 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!

9. 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!