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<p>[QUOTE=&quot;Just Carl, post: 570615, member: 4552&quot;]Not really. Would a college chem teacher do? </p><p>Actually the problem you mention is what is used in industry to read fractional and exactness in changes in temperatures. When two different metals touch each other there is an exchange in electrical charges but insufficient for most people or even machinery to record. If you&#039;ve heard of Thermocouples used in industry and in many homes, those are exactly what is used. Not to be to boring but for example if a pipes temperature changes is required, a hole is place in the pipe called a thermowell. It is treaded and a thermocouple head is screwed into that. Now two well insulated wires of different metals is place in that head with the insulation off and connected together. At the other end is a temperature gauge. If the pipe changes in temperature, a current is created and the gauge records that. </p><p>Sorry for that boring story. </p><p>However, in the instance shown here, there is no eletrical problem unless the location of that tube is under constant changes in temperature. Then naturally, those coins will eventurally corrode.</p><p>I would suspect that more damage is done every time those coins are taken out and DUMPED back in that container. </p><p>As already noted you should really look into those cardboard type flips for coins.[/QUOTE]</p><p><br /></p>

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