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There are two main components to the answer. Both depend upon the fact that metal and glass expand when heated:
1) The metal in the lid might be a kind of metal which expands faster than glass when heated. So, if you heat the jar and the lid together to above room temperature, the lid will become a little too big for the jar, and will come off more easily.
2) If you direct the heat to the lid only, and avoid heating the glass, the lid will get hotter than the glass, and will expand, while the size of the jar remains the original size. This, too, will cause the lid to be too big for the jar, and cause it to come off more easily.
What else can I help you with?
Can you get pregnant by sticking your place under running water?
Not unless it's running with sperm!
When opening a pool what chemicals do you use and how do you get a sand filter up and running?
Pray for a salt water system
Why does the cap on the jar is stuck but if you run it under hot water we can unscrew the metal cap?
Running the jar lid under hot water causes the metal to expand slightly, making it easier to unscrew. The heat helps to break the seal created by the contents of the jar, allowing you to open it more easily.
How do you sharpen a throwing star?
you sharpen it on a stone under running water
Explain why running some hot water over the lid might make it easier to open?
Heat makes metal expand so running hot water over a lid allows it to become slightly bigger, therefore loosening it and making it easier to turn off the jar.
Food should be defrosted in the microwave under cold running water or?
in the refrigerator
How do you care for an athlete with frostbite hands?
put them under running warm water.
Why is it a good idea to run a metal lid under hot water?
yah its not gonna explode... actually, the real reason for this, is that- Property: Solids expand on heating and contract on cooling. Explanation: Sometimes, in winter, the metal lid cools down and it contracts and gets stuck on the mouth of the container. So, to separate it from the container, it is put under hot water. Thus, it gets heated and expands, and gets separated from the container.
How come hot water makes opening a jar easier?
It can change the size of a metal cap ___ & ___ it can loosen any sticky stuff on the threads.
How do running water and plumbing make desert life easier?
It helps people in the desert to have fresh water, and they do not have to dig for ever to make a well or something and the people in the desert will wake up and know that they have fresh water running through pipes.
Why is it easier to hold someone in the water?
Because of buoyancy. just on top. try holding them under the water, it gets harder
Where could water running from a drain pipe leading from under a house be coming from?
Rain
