Hello Fire-breathers,
Char conductivity has been linked to the structure and properties of
wood char.
This paper proposes that a structural change occurs, from double
bondeded (C=C )carbon to single ( C-C) bonds, when carbonizing wood at a
temperature somewhere between 600-800C. This is right in the common or
normal TLUD operating range.
www.geocities.jp/yasizato/Yoshizawa15.pdf
The video shows a very simple way to check for char conductivity by
shorting the terminals of a 9 volt battery with a charred wood chip.
http://www.youtube.com/watch?v=-69IWPB91Ec&feature=youtu.be
A multimeter can also be used to measure the resistance in ohms, or the
current can be measured in circuit with a 9 volt battery and the
resistance calculated. R(Ohms)=Volts/Amp
For example, I measured 50 milli Amps of current through one of these chips.
9Volts/.05Amps=180 Ohms
I have also measured zero Amps, "infinite" resistance, a non conductor.
This may be the easiest field test for characterizing char next to the
oily finger test and the ouch that's still hot test.
Should be able to do thousands of tests with a single battery.
Put a 9 volt battery it in you TLUD kit and shed some light on into the
black box that is charcoal :)
Alex
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