Degree Celsius
= Degree Celsius
{title2=${}^\circ\mathrm C$}
The degree Celsius has the same size as the <kelvin>, with a shifted temperature origin: $t/{}^\circ\mathrm C=T/\mathrm K-273.15$. Thus a change of one degree Celsius is a change of one <kelvin>, but temperature ratios in <Carnot's theorem> must use absolute <thermodynamic temperature>.<The International System of Units (SI), ninth edition, SI Brochure>{ref}