What does an iron ring become when heated for fitting?

When an iron ring is heated, it experiences thermal expansion, which means that it increases in size due to the energy from the heat causing the atoms to move more vigorously and occupy more space. This physical property of materials is a fundamental principle in physics known as thermal expansion.

When fitting an iron ring, this expansion can facilitate processes such as fitting the ring onto another object or adjusting its shape. As it cools down, the iron ring will contract back to its original size, creating a tighter fit if necessary.

Thermal expansion is an important consideration in various engineering and construction applications, especially when designing components that will endure changes in temperature. Understanding this principle ensures that materials can be accommodated appropriately during assembly and use.