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How you can get the metal lid in the jar should you heat it or cool it?
Wiki User
∙ 14y ago
cool it. When molecules are cooled they compress.
Wiki User
∙ 14y ago
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Why do you use hot water to remove a tight metal cap easily?
Often, lids are made of metals which are great conductors of electromagnetic waves (including heat). When warm water is applied to a "difficult" lid, excitement of the atoms in the metal occurs (very slight) which causes a slight expansion. This expansion helps the lid to be moved from it's grip on the jar or bottle. This is also found in plastics. Although not through expansions. The heat from the warm water literally softens the plastic.
Why a glass jar can open easily if the metal lid is heated gently first?
Heat causes the metal to expand, thus breaking the seal.
Why does a hot liquid in a jar dent the metal lid?
ause the boigraphical heat which is being given off which can not escape from the jar because they are designed to be sealed as tight as the owner wants them to be!
Why is it easier to remove a metal lid off a glass jar when soaked with hot water?
The heat causes the metal lid to expand, making it slightly bigger.
How cool is jar jar binks?
Depends on what people think of him
How can hot sauce be preserved?
Keep it in a tightly closed jar. In a cool place it should be fine.
Why can a jammed metal lid of a jam jar be opened by heating?
When you heat the jar, the glass expands only slightly while the metal expands much more. This is governed by the coefficient of expansion for the substance. The greater the coefficient of expansion, the more the substance expands. Since metal generally has a much higher coefficient of expansion, the lid of the jar will get bigger while the jar only expands slightly. That makes everything a little looser, which makes it much easier to open the jar.
How do you airtight jars?
To airtight jars, make sure the jar and lid are clean and dry before sealing. Fill the jar with contents, leaving some headspace at the top. Secure the lid tightly and store the jar in a cool, dry place.
How does heat cause a jar to seal tight when in general heat causes objects to expand?
Heat should not cause a jar to seal more tightly. There is an excellent reason for this, and it lies in the physics of the coefficient of thermal expansion (CTE) of materials. If you run hot water on the (stuck) lid of a glass jar, the jar will undergo only a little thermal expansion. The metal lid however, will expand more than the glass, and will do it more rapidly, too. Running a jar under a bit of hot water should act to loosen the lid instead of tighten it. The CTE of metals is higher than that of glass, and the lid, because it is metal, will also have a higher rate of thermal conductivity than the glass. Thermal energy will move through it more quickly to change its size. This double whammy should not cause the lid of the jar to tighten. If the lid is still stuck, then insufficient force has been applied to it to get it unstuck. Increased care is indicated as efforts are redoubled to remove the lid.
How could you use thermal expansion to help get a tight lid off a jam jar?
Heat the metal lid (but try not to heat the glass jar as much) and the thermal expansion will make the lit easier to screw off (I do this often by running the lid under hot tap water).
What is the difference between a mason jar and a kilner jar?
The main difference between a mason jar and a kilner jar is the top. A kilner jar has a rubber-sealed screw top, while a mason jar has a disc-shaped metal lid and an outer metal part that screws around it.
Why you must heat up the lid of a jar to make it easier to open?
Simply because the metal lid expands quicker than the glass jar - making it loose. The lid will return to its original size when it's cooled back to room temperature.
