Heat is thermal energy. It can be transferred from one place to another by conduction.
Metals are good conductors of heat, but non-metals and gases are usually poor conductors. Poor conductors are called insulators.
Heat energy is conducted from the hot end of an object to the cold end.
The ions are packed closely together and they vibrate continually. The hotter the metal, the more kinetic energy these vibrations have. This kinetic energy is transferred from hot parts of the metal to cooler parts by the free electrons.
These move through the structure of the metal, colliding with ions as they go.
Conduction in metal
An experiment can be used to investigate which metal is the best conductor of heat. It involves some long thin strips of different metals (eg steel, aluminium and copper), wax, drawing pins and a Bunsen burner.
The fastest time shows the best conductor of heat.
Variables that affect the time taken for the drawing pins to fall include the distance they are from the flame and the thickness of the metal.
If you have controlled all of these variables, you should find that copper conducts better than aluminium, while aluminium conducts better than steel.