SCIENCE FROM THE KITCHEN ITEMS

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DANCING RAISINS

You can make a nice dancing raisin experiment, for this experiment you will need:

YOU WILL NEED:
a bottle of colorless soda (e.g., drinking soda, 7-Up or Sprite)
a tall, clear glass or plastic cup
several fresh raisins


INSTRUCTIONS:

Pour the soda into the tall glass. Notice the bubbles coming up from the bottom of the glass. The bubbles are carbon dioxide gas released from the liquid.

Drop 6 or 7 raisins into the glass. Watch the raisins for a few seconds. Keep watching; raisins will start dancing and continue to dance for next several minutes




SCIENCE BEHIND

Raisins are slightly denser than the liquid in the soda, so initially they sink to the bottom of the glass. The carbonated soft drink releases carbon dioxide bubbles. When these bubbles stick to the rough surface of a raisin, the raisin is lifted because of the increase in buoyancy. When the raisin reaches the surface, the bubbles pop, and the carbon dioxide gas escapes into the air. This causes the raisin to lose buoyancy and sink. This rising and sinking of the raisins continues until most of the carbon dioxide has escaped, and the soda goes flat. Furthermore, with time the raisin gets soggy and becomes too heavy to rise to the surface.

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