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When metal is heated, the atoms begin to vibrate. This increased motion causes the atoms to move farther apart. When the atoms move farther apart, the metal expands.

www.metalsupermarkets.com/how-heating-metal-affects-its...

There are a number of ways of heating metal which are commonly used to transform these properties. The temperature to which the metal is heated and the rate of cooling are carefully controlled to achieve the desired outcome. The Effect of Heat on Metal. The most important ways that metals are transformed through heat: Electrical Resistance

www.thebalance.com/what-happens-when-metals-undergo-heat...

Annealing is a form of heat treatment that brings a metal closer to its equilibrium state. It softens metal, making it more workable and providing for greater ductility. In this process, the metal is heated above its upper critical temperature to change its microstructure. Afterward, the metal is slow-cooled.

www.answers.com/Q/What_happens_when_metals_are_heated

The particles will start to get really warm and then vibrate and if they get heated for so long the metal will change state and. ... or gas is heated they expand. This happens because the ...

www.quora.com/What-happens-to-the-metals-when-they-are...

The metal bar will deflect with the center moving upward toward the bunsen burner flame and the ends moving downward towards the liquid nitrogen. A thermal gradient will form in the vertical direction and heat will flow from the hot top side to th...

www.answers.com/Q/What_happens_to_metal_when_they_heated...

When a metal or any other solid, liquid, or gas is heated they expand. This happens because the molecules that make these substances start to move or "shake" more than they already do.

sites.google.com/.../expanding-ball--ring--thermal-expansion

Explanation: Most materials when heated will expand (water being one exception when its temperature is close to zero degrees celcius). If various metals are heated in a bunsen flame then they will expand. Conversely if they are cooled they will contract. If a metal plate containing a hole is heated then the whole plate will expand including the hole.

www.exploratorium.edu/snacks/cool-hot-rod

You can also loosen a tight jar lid by running hot water over it, causing the metal lid to expand more than the glass. The expansion and contraction of materials when they are heated or cooled is commonly used to make thermometers and control thermostats.