3 ms·

It is necessary to specify it because what happens if someone tells you it was -40 and then it got 1 degree warmer. How cold is it now?

• mark-r 6y ago
  Obviously it's -39, and since -39C and -39F are different you'd now be required to specify. If you knew which scale the 1 degree was from it wouldn't be difficult.
  • oh_sigh 6y ago
    It's -40 and it got -1 degree F colder. How cold is it now?
    • mark-r 6y ago
      It's now -41F. It's not really rocket science, unless you're trying to trick me with a double negative.