These photos show the drop in electrical resistance when you pour liquid nitrogen on the YBCO. Here is the before at 1.3 ohm:
After liquid nitrogen:
As a point of reference, the lowest the meter goes when the clips are connected together is 0.5 Ohm.
Frost forms from the extreme cold:
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*NEGITIVE* 1.8 ohm? How is that even possible — either the coil is acting as a generator, or your meter is broken?
I’m guessing it’s just not zero’d correctly.
Stuart says that these meters are only accurate to 12 ohms or so.