how to play with your food: science at the dinner table robert sparks national optical astronomy...
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How to Play With Your Food: Science at the
Dinner Table
How to Play With Your Food: Science at the
Dinner TableRobert Sparks
National Optical Astronomy Observatory
Robert SparksNational Optical Astronomy
Observatory
Pinon Teacher WorkshopOctober 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
Pinon Teacher WorkshopOctober 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
Pinon Teacher WorkshopOctober 13th, 2007
The Atomizer!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!
Pinon Teacher WorkshopOctober 13th, 2007
The Atomizer!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
Pinon Teacher WorkshopOctober 13th, 2007
Straw Through the Potato!Straw Through the Potato!
Can you take a straw and drive it through a potato?
Can you take a straw and drive it through a potato?
Pinon Teacher WorkshopOctober 13th, 2007
Straw Through the Potato!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
Pinon Teacher WorkshopOctober 13th, 2007
The Finale: Mentos and Diet Coke Geyser!
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!
Pinon Teacher WorkshopOctober 13th, 2007
The Finale: Mentos and Diet Coke Geyser!
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!