• floquant@lemmy.dbzer0.com
              link
              fedilink
              English
              arrow-up
              2
              ·
              edit-2
              2 days ago

              Is the difference that they can go negative or…? I never quite understood what makes them “degrees”

              • Iunnrais@piefed.social
                link
                fedilink
                English
                arrow-up
                4
                arrow-down
                1
                ·
                2 days ago

                No, the difference is that if you double a kelvin number, you have quantifiably doubled the heat. If you double a Celsius or Fahrenheit number, you have not quantifiably doubled the heat… the number does not objectively count an amount of something.

                Think meters. A meter measures an exact length. Two meters is double one meter.

                Celsius doesn’t do that. Celsius is a scale between two amounts of heat.

                The equivalent for distance would be if we had a scale where 0 degrees distance was equal to 582.7762 meters, and 100 degrees distance was equal to 721.5323 meters. Each degree between 0 and a hundred is then a slice of that range. Maybe for the people who designed such a scale there’s useful reasons to do so, but you aren’t measuring the quantity or amount of something, you’re measuring a range.

                Kelvin measures molecular movement, just as hertz measures oscillations or cycles, or grams measure weight.