However, I must point out, Celsius is not metric. It’s been adopted as the step-child of SI, but it’s not metric. You can’t meaningfully multiply and divide degrees Celsius; 100°C is not ten times hotter than 10°C Celsius. Sure. you can use the metric prefixes, just like i could measure things in kiloinches, that doesn’t make it metric. It’s just as arbitrary as Fahrenheit, and people have to make arguments regarding water and life to try to pretend otherwise. True, it’s officially defined in terms of Kelvin, but then, so is Fahrenheit.