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You can measure molten metal by looking at it

HERE’S THE INTERESTING PART

Sticking a thermometer into a blast furnace is a rookie mistake, so we invented a way to look at the heat instead. Pyrometers measure the thermal radiation emitted by a surface to calculate its temperature without ever touching it. It is weaponized voyeurism for metallurgists who value their eyebrows.

You can measure molten metal by looking at it
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