WHAT YOU NEED
- A drinking straw
- A glass of cola
WHAT TO DO
Suck from the straw and cover the other end of the straw with your finger and lift it up out of the cola.
Now, remove your finger while bringing the straw to the table.
WHY THIS HAPPENS
When your finger had the straw covered, the cola remained in the straw. When you removed your finger, the cola flowed out.
The finger on the straw lessened the pressure of air from above the straw. The greater pressure of air under the straw holds the cola.
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