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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!

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Q: Why does a hot liquid in a jar dent the metal lid?
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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.


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There are several purposes of the lid and rim on home canning jars. The 2-piece closure allows air to escape from the jar during processing. The air is pushed out of the jar by steam building up in the jar during the hot water bath method and from pressure in a pressure canner. During the canning process the air escapes under the lid. This is supposed to happen. If improper headspace is left in the jar it can cause liquid to escape from the jar when the air is vented. Check your recipes closely for headspace and measure each jar when filling.


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.


How you can get the metal lid in the jar should you heat it or cool it?

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Why are jar lids immersed in water for a few seconds?

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How does pouring hot water on a lid helps to remove it from a glass jar?

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