Why may a person break a thermos bottle by tapping lightly on the stopper?
- Why may a person break a thermos bottle by tapping lightly on the stopper?
Homework Answers
If you hit the bottom of a jar while it is upside down, it loosens the contents and piles them on the lid. If the inside pressure is less than the outside pressure, which should always be the case if the jar was vacuum packed, this may provide a little extra pressure to counteract the outside pressure that is holding the lid on.
Tapping on the bottom may also release water vapor and/or other gas from the contents (like shaking a soda bottle), which will help counteract outside pressure. The same effect may result from hitting the lid, with the added bonus of deforming the lid slightly and breaking the vacuum seal.
But the safest way to loosen a tight cap may be to run hot water on it so that it expands slightly. Glass has a lower thermal expansion coefficient than metal, so this method usually works.
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