In almost every other case, when a unit is named after a person, the symbol is capitalized and the word is not (for example, N for newton... for Isaac newton, where the symbol is capitalized, but the word for the unit is not). For Celsius, though, they made an exception, both C and Celsius are capitalized.
AnswerCelsius is not an SI unit, so the coventions for writing SI symbols do not apply.
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5 °C - 10 °C = -5 °C (i.e. 5 degrees Celsius below 0 °C or 5 °C below freezing)
Subtract the numbers: 5°C - 11°C = (5-11)°C = -6°C
Celsius to Fahrenheit: [°F] = [°C] × 1.8 + 32Fahrenheit to Celsius: [°C] = ([°F] − 32) × 5⁄9
16
Fahrenheit to Celsius: C= 5/9(F-32) Celsius to Fahrenheit: F= 9/5*C+32