Question

at home you might have noticed your your mother trying to open the tightly jammed metal lids of food jars by pouring hot water over the lid. what will happen doing so?​

Answer 1

Explanation:

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.

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Answer 2

Explanation:

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.