I was about to make the same comment: the freezing point of water is a really odd choice to make up a ratio for.
If you have to do it, you’d almost always use Kelvin, or in a pinch the equilibrium temperature of a big greenhouse 1 AU from the sun, i.e. 20C.
So like 3 people...
My point is talking about Kelvin is meaningless to the vast majority of people on HN, including myself. Everyone (Except the US) knows Celsius, and it's easy to gague how cold something is looking at it in Celsius. In Kelvin its just 'ok that's a number...'
Just about everything human-built around you had someone consider the thermodynamics of it during the design.