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Your examples are scalar quantities and the "standard convention" is
I think this is a little overly general. I agree with the concern
expressed about saying that -4 m/s is "less than" 2 m/s. But there are
plenty of times when the standard convention is exactly what we mean. An
altitude of -200 m *is* less than an altitude of +100 m; -20 degrees C
*is* less than +10 degrees C; etc.