Freezing point of water:
0 °C, 32 °F, 273.15 K, 491.67 R.
Just because I'm trying to memorize this (and it's taped on my mirror too), here is the Fahrenheit/Celsius conversion:
Fahrenheit to Celsius: [°F] = [°C] x 9/5 + 32
Celsius to Fahrenheit: [°C] = ([°F] − 32) x 5/9
At negative 40 degrees, Celsius and Fahrenheit converge.
The various thermodynamic temperature scales used today are Celsius, Fahrenheit, Kelvin and Rankine, named after Anders Celsius, Daniel Gabriel Fahrenheit, William Thomson (1st Baron Kelvin) and William John Macquorn Rankine. What is the Rankine scale, you ask? It's basically Kelvin if it were based on Fahrenheit instead of Celsius. It starts measuring temperature with its zero point at absolute zero like Kelvin, and then uses degrees Fahrenheit from there up. Confusing. Yeah, I'm not a math major.
By the way, that Wikipedia article (what, you think I'm doing actual research on a Wednesday night?) is kinda out of date. It may be impossible to reach absolute zero through natural means, but metatechs have been doing since Dr. Miracle (or Miriam S. Closson, as she was called during her undergrad days) invented the Zero Point Chamber for her thesis in 1974, or was it 1975? Depends on your point of view on that whole time travel thing. Personally, I think it's kinda cheating to get an extra eight months to work on your thesis due to a chronal loop in your dorm room.
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