That's rather tangential to my point, which is the phrase "twice as cold" as used here is tricky to interpret. What does "twice as cold" mean? In the US, is -2

That's rather tangential to my point, which is the phrase "twice as cold" as used here is tricky to interpret. What does "twice as cold" mean? In the US, is -2°F twice as cold as -1°F? Yet that's only -18.33°F to -18.89°F, so only 0.3% colder if you change temperature scale. Is 16°F twice as cold as 32°F? Or half as warm? Is -10C infinitely colder than 0C? I used Kelvin as an example of how the ratio depends on the scale chosen, not because it's popular. Note that Rankin (Rankin is to Fahrenheit as Kelvin is to Celsius) would give the same answer as Kelvin - both Rankin and Kelvin are absolute scales of temperature, and would better candidates for defining what "twice as cold" means. (Though even better would be to say "half has hot".) However, I was not saying that we should all use Kelvin, only that the phrase is tricky to interpret.