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What's solid?
A solid element (not liquid and not gas) that lies about half-way between a perfect insulator and a perfect conductor are classified as a semiconductors.
Under certain conditions, a semiconductor's "conductability" (if such a word exists?) can be varied more to either end of this scale. It is this property that gives a semiconductor it's ability to amplify current.
Semiconductors are not normally natural elements that are solid matter but are modified (doped with other materials) to give them the specific properties that make them work.
Paul
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