"10 degrees below zero." I had always thought (until now) that this means 22 degrees farenheit or negative-whatever-the-conversion-is degrees celcius. I thought "zero" was a term for freezing even though Americans do not usually measure temperature in celcius, the phrase "XX below zero" still means below the 0 degree celcius or freezing. By saying "10 degrees below zero" does that mean I'm saying -10 farenheit since I live in the States? I understand that below zero implies you using celcius and/or implies that you're talking about -10 farenheit, but I had always thought, "below zero" was a figure of speech. I mean, who says it's "10 below 32?"