Lab Speed of Bubble

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How fast will the bubble raise? You can use your stopwatch to determine the speed of the bubble in each tube. The distance from the start of the bottom tape and the bottom of the top tape is given. Using the times measured and the distances given in the video you can determine the speed of the bubble in each tube.
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Is there something in the green tube besides a bubble? Do these tubes contain real air bubbles that naturally occurred in the unfilled part of the tube?

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