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https://www.nist.gov/image/commercial-circuit-boards

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# Commercial circuit boards

## Appears In

                        - Measuring Up: Coming Out from the Cold

The photo shows green commercial circuit boards – the largest is 11.4 cm (4.5 in) by 19 cm (7.5  in) – inside a dilution refrigerator. When enclosed and pumped down, the system reaches temperatures only a few thousandths of a degree above absolute zero.

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