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PhD candidate Frederick Held adds: "Until now, we have been able to describe the trends, but it would be great if we were able to establish an absolute temperature value."

Nor is the absolute temperature itself the key metric; what is important is whether the temperature surpasses records set in the same place over the last 72 years.

This heat wave will have lower absolute temperatures in part because the event will happen a month earlier than the 2021 heat dome.

Thermal cameras do not measure absolute temperature but rather the difference in energy emitted between one object and another.

For those who like the details, the speed of sound is proportional to the square root of the absolute temperature.