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17 votes

Why does squeezing a water bottle make the water come out?

Treating the toothpaste in the tube (or the water in the bottle) as incompressible, if the tube is full then the volume of the inside of the tube = the volume of toothpaste inside the tube. … Assuming the bottle is completely full of water, the decrease in the bottle's volume will be easily measured by capturing the water that spills out and measuring its volume. …
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