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Bouncing Raisins

Materials

• 6 raisins
• Glass tumbler
• Vinegar
• Baking soda (or Alka Seltzer tablet)

Directions

1. Pour a cup of water into the glass jar.
2. Add one teaspoon of baking soda and stir until dissolved.
3. Gently add one-fourth cup of vinegar and wait until it stops fizzing.
4. Drop in three or four raisins.
5. Watch and see what happens (it takes about 10 to 15 minutes).

Note: The gas, carbon dioxide, that forms when you add vinegar to the baking soda forms bubbles all over the raisins. The raisins start to rise as the bubbles of carbon dioxide carry the raisins upwards and they fall when the bubbles are released.