![]() You first drew a line on a piece of paper using a pencil and measured its resistance to create a baseline to work up from. They'll be oriented randomly, so expect the high resistance. Thing about pure graphite (of the "Holy cow! A non-metal that conduct electricity!!!" fame) is that it only conducts (really well) along a particular plane try another plane perpendicular to this and you'll find it to be a thousand times less conductive ( see answer to this question).Įven if your powder is (largely) graphite, surely the individual powder particles aren't going to align themselves into an extended plane between your terminals. ![]() "Graphite's pretty conductive (low-ish resistance) and charcoal is a poor conductor (very high resistance), so doesn't this test tell me something?" for nothing (you have my deepest sympathies). ![]() Graphites typically have have a much higher density (slight variation depending on purity and crystal defects) than water, so pieces of "graphite" would sink.īlocks of charcoal typically have lower densities (varies depending on type/source of charcoal) than water and hence floats, but that changes when you pulverize them (and destroy most of the air cavities in the process). This is easily disrupted by stirring/agitation, and as you've noticed, it'll sink. well, they aren't technically "floating", it's the surface tension of the water that's holding it up. Even particles denser than water are known to "float" in these circumstances. Upon stirring, it darkens the water and then gradually sinks back to the bottom after some time.
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