When a copper ball is heated, its temperature increases and the metal begins to expand. This is because heating causes the copper atoms to vibrate more rapidly, which increases the distance between them and makes the overall volume of the metal larger. As the temperature continues to rise, the copper ball may become red-hot or even start to melt if the temperature is high enough. If the copper ball is in contact with another material, such as air or another metal, heat energy will transfer from the copper ball to the other material, causing it to heat up as well.
