This phenomenon can be explained by the concept of thermal expansion. When the copper ball is cold, both the ball and the ring are at a similar temperature, so they both have a similar size. However, when the ball is heated, it expands due to the increase in temperature. This expansion causes the ball to become larger than the ring, making it unable to fit through the ring.
In simpler terms, when the copper ball is heated, it expands and becomes larger in size, making it too big to fit through the ring.
A copper ball easily slides through a copper ring when it is cold but after the has been heated it does not fit through the ring anymore
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