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A New Way to Take the Temperature of Materials Too Thin to See
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A New Way to Take the Temperature of Materials Too Thin to See
Take a platinum wire twenty-five micrometres across, which is roughly a quarter the width of a human hair, and suspend it in a vacuum between two aluminium electrodes. Apply a pulse of electrical current. For the next few seconds, the wire warms, its resistance climbs, and the voltage across it shifts in a way that encodes, precisely, how fast heat moves through the metal. That is essentially the whole experiment. The elegance of it is almost ir…
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