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Pencil lead

British pronunciation/pˈɛnsəl lˈiːd/
American pronunciation/pˈɛnsəl lˈiːd/
Pencil lead

mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil

synonyms : lead
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pencil lead definition and meaning
1We then take our pencil lead and draw our carbon nanotubes-based sensor between the electrodes.
2Also, one is pretty and one is pencil lead.
3To make our pencil lead we take a commercial powder of carbon nanotubes and compress it into the shape of a lead using a press.
4But it's just carbon, the same element that makes up the graphite in this pencil lead, which is so soft, that it's intended purpose is to rub off on stuff.
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