Higher tier: Conduction in solids
The All elements are made of atoms. An atom consists of a nucleus containing protons and neutrons, surrounded by electrons. of a solid are held together by chemical bonds.
They are fixed in place but are free to vibrate.
When part of a solid absorbs heat energy the atoms vibrate faster and with bigger amplitude.
These vibrations pass from atom to atom transferring heat energy as they do so.
This process happens in all solids when heated but is a slow process.
Image caption, Conduction in a solid
A solid is heated up
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