So, overnight was the first time this winter where the temperatures dropped below 0°F. Younger girlchild was unfamiliar with numbers less than zero, or 'to the left of zero on the number line', as it hasn't yet been introduced in school.
Had to explain that the stupid 'Fahrenheit scale' the US still clings to was invented before better science -- including before refrigeration. So, Herr Fahrenheit made a mark on his newly-invented thermometer on the coldest day of the year and called it 'zero', because he had no means of producing colder temperatures. Accordingly, he made a mark on his thermometer on the hottest day of the year, and called it 100. We, near the Great Lakes of North America, get temperature extremes beyond those of 17th century central Europe, apparently.
So much for climate discussions.
So... what do people call it when temperatures go below zero -- Fahrenheit or Celsius? (And no, 'F*cking Cold' isn't an acceptable response). And please don't preach to this choir about the wondrousness of Kelvin or Centegrade (or even Rankine) scales.
Do you say "Minus ten", "Negative ten", or simply "Ten Below"?
It never occurred to me that, as a scientist/engineer, I've been trained to say "Negative Ten", whereas non-technical people tend to say "minus ten" or "ten below". Understanding Spouse has never pointed this quirk of mine (Saying "Negative" before the number) out to me before this morning.
What do you, dear reader, say when speaking about temperatures?