The process that takes place when a metal lid is immersed in hot water is known as Thermal Expansion.
Thermal expansion refers to the increase in a material's volume with an increase in temperature. Every linear dimensional shape, increases by the same proportion as the temperature rises during thermal expansion.
This implies a uniform expansion of the material. When applied to a metal jar lid, this means that the internal diameter will expand, causing the lid to loosen up. A direct hot water stream towards the middle of the lid warms and heat the metal much more than the glass, resulting in a larger gap in the jar expansion.
In conclusion, the process that takes place when a metal lid is placed or immersed in hot water is called Thermal Expansion.
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