why does tooth paste come out when we press the tube?
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The tube of fixed volume is filled with a liquid. When you squeeze the tube, you effectively change the volume, forcing the toothpaste through the top.
Notice that if you squeeze a full tube with the cap on, nothing happens. You are trying to change the volume of the tube by squeezing it, but since the cap is on, the toothpaste won't squirt out. This is when you're effectively pressurizing the toothpaste. And if you squeeze really hard with the cap on, you will eventually overcome the strength of the tube, and it will burst.
Notice that if you squeeze a full tube with the cap on, nothing happens. You are trying to change the volume of the tube by squeezing it, but since the cap is on, the toothpaste won't squirt out. This is when you're effectively pressurizing the toothpaste. And if you squeeze really hard with the cap on, you will eventually overcome the strength of the tube, and it will burst.
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