Why the density of some solutions is expressed in grams liter-1 degree?

Why the negative degree is used here ? Why here it is impossible to use a positive degree? What from it will change?

Answer:
I assume that the negative in this case implies per degree, it is not actually giving a degree as an integer. So the density is being given in grams per litre per degree. This is a quirk of scientific notation rather then an actual reflection of the value of the temperature part of the measurement.

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