How does hot water help to remove a metal lid from a glass jar?

The metal lid expands at a faster rate than the glass jar, which forms a gap between the metal lid and the glass jar. This gap grows as the metal lid expands, until the lid pops open from the jar. Use a dish towel.

How does running hot water on a jar lid loosen it?

If we assume it is your average glass pickle-jar with a metal top than heating up the jar will loosen the lid because the metal conducts more heat than the glass. As the lid loosens the normal force the glass produces to push back on the lid is decreased so the Frictional force is lowered.

How do you remove a metal lid from a glass jar?

Hot Water Using hot water is a time-tested solution for removing stubborn lids. Just run the lid area of the jar underneath hot running water for 30 seconds or so. The heat will cause the lid to expand slightly, which should loosen the seal. Just give it a twist to remove the lid (but be careful not to burn yourself!)

Why does hot water make jars easier to open?

The hot water helps the metal expand, therefore loosening the lid and making it easier to unscrew.

When the metal lid of a glass is too tight to be opened the lid is immersed in hot water Why do you think this is done?

This is because of pressure difference outside the glass jar and inside the glass jar, this pressure difference makes the gasses inside the glass jar expand as air expands on heating, the warm water make the gases in the glass jar expand thus pushing the metal lid to open up in the warm water.

How do you expand metal?

When a material is heated, the increase in energy causes the atoms and molecules to move more and to take up more space— that is, to expand. This is true of even a solid such as a metal. However, different metals respond to heat to a different extent depending on each one’s unique coefficient of thermal expansion.

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