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if you are talking about a can, and why the top pops up, like i think you are, it is because of the increased presure inside the can/ bottle/ jar/ whatever.

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Lupe Hahn

Lvl 13
2y ago

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Why you must heat up the lid of a jar to make it easier to open?

Heating up the lid of a jar causes it to expand slightly, which can help break the seal between the lid and the jar. This makes it easier to open because the expanding metal in the lid relieves some of the pressure that is holding the lid tightly in place.


What is the word fulcrum mean?

The fulcrum is that point where a lever is fastened to a stable point. Usually it is in the middle of the lever (as when you pry the lid of a paint can) but it can be at the end (as in the case of a bottle opener). When the fulcrum is at the end, the force that results is in the same direction as the force you apply; you lift up on the bottle opener and it lifts the bottle cap up. When the fulcrum is in the middle, the resulting force is in the opposite direction to the force you apply; you push down on the prybar and the paint can lid goes up.


Why we can heat up the lid of a jar to make it easier to open?

Heating the lid of a jar causes the metal to expand, breaking the seal between the lid and the jar. This makes it easier to open because the pressure inside the jar is released, reducing the force needed to twist the lid off.


Why is it difficult to lift the lid when the water cool down?

When water cools down, it contracts and takes up less space. This creates lower pressure inside the container compared to outside, making it harder to lift the lid due to the increased atmospheric pressure pushing down on the lid.


How could you use thermal expansion to help get a tight lid off a jam jar?

You can run the lid under hot water to heat it up, causing it to expand slightly and loosen its grip on the jar. Alternatively, you can use a hair dryer to heat the lid for the same effect. Be careful not to overheat the lid or the jar to avoid potential damage.

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