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Key Facts In This Video
Celsius had his scale upside down from the scale we use today, as did his predecessor. That's to avoid negative numbers. 01:15
Its origins are unclear, but we do know that by 1745, there was a thermometer at Upsala University with the Celsius scale we know today. 02:27
Celsius was the first to establish which physical processes could reliably produce a fixed temperature. Past scales had used wildly unreliable standards. 04:28