Good conductors
The metallic structure is composed of a lattice of metal ions, and a sea of ‘free electrons’ that move throughout the structure.
When one end of a metal is heated, the metallic ions gain energy and vibrate faster.
Ions are close together, so vibrations are passed onto neighboring ions which in turn, begin to vibrate quicker too.
Through the passage of kinetic energy in the form of vibrations, heat is transferred from the hot end to the cold end.
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As the copper bar is heated at one end, the drawing pins will fall off one by one (from the one closet to the bunsen burner). This is because the metal conducts heat from the hot end to the cold end, and in doing so, melts the blobs of wax.
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Poor conductors (insulators)
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Set-up & procedure
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Set-up & procedure
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