What would you like to know? Regarding temperatures: ‘Kelvin’ is the proper SI unit. It starts with 0 at absolute zero. And then uses the same size for units as celsius uses. So 0°C (the point at which ice made from water melts) is 273.15 Kelvin. 20°C about where you’d wear a t-shirt is about 293 K. So we don’t say it that way but keep saying it’s 15 or 30°C outside.

Scientists do it right. When you’re melting metal or talking about the temperature of the sun, you won’t have small numbers anyways and you won’t use celsius. You can translate it easily, anyways. Just add and substract the 273.15. You don’t need a formula and a calculator like when you translate between farenheit and celsius.