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Gas produced during reaction will produce bubbles due to the property of surface tension of the liquid. Air or gas is less denser than the liquid in which it is produced. Also due to Archimedes principle, the weight of the liquid displaced by the air or gas bubble will be more than that of bubble itself. So upward buoyant force is heavy which pushes the bubbles to the top of the test tube.

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โˆ™ 2009-10-20 17:04:20
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Q: How does an air bubble collect at the top of a test tube?
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How do you collect unbreathed air?

Any 'empty' container is really full of air, so you don't have to do anything. Pick up a test tube. It's full of air.


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If an inverted tube containing air is placed above a test tube of hydrogen why would the tube of air give a positive test for hydrogen after a few minutes?

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Is a test tube holder the same as a test tube clamp?

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Scientists collect and test air sample because they want to see how clean/polluted it is. Then they can raise awareness to people if needed.


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