Materials may be natural or man-made. They may exist as solids, liquids and gases, and as a mixture of states.
A short article based on an extract from Topics in Safety, Topic 17 (Electricity), which is freely available to Association for Science Education (
ASE Health and Safety Group
The popular science shows that strip science down to its bare essentials.
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This resource explores density, resistivity and electrical conductivity in the context of copper.
Copper Development Association