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> Zero C is not very special. Zero Kelvin is! I agree that Fredrickson is grasping for relevance. However, 0 °C is special to water-based lifeforms. 0 °C is
by mietek 9y ago
> Zero C is not very special. Zero Kelvin is!
I agree that Fredrickson is grasping for relevance. However, 0 °C is special to water-based lifeforms.
0 °C is defined as 273.15 K, or the temperature at which the three phases of water are in a thermodynamic equilibrium — at a pressure of 1 atm, or 1 standard atmosphere.
The degree Celsius is defined as equal to the kelvin, so the Celsius scale is a shifted version of the Kelvin scale.
https://www.bipm.org/en/publications/si-brochure/kelvin.html https://www.bipm.org/en/publications/si-brochure/kelvin.html
https://www.bipm.org/jsp/en/ViewCGPMResolution.jsp?CGPM=10&RES=4 https://www.bipm.org/jsp/en/ViewCGPMResolution.jsp?CGPM=10&R...
- RachelF 9y agoActually, to off-topic nitpick, the triple point of pure water is at 0.01°C (273.16K), not 0°C
- leereeves 9y agoIsn't 0.01 °C the triple point of water (the temperature at which the three phases of water are in a thermodynamic equilibrium)? The triple point is a better standard and is used now, but it's not exactly 0 °C because that was defined by calling the melting point of water 0 °C.
- ars 9y ago> 0 °C is special to water-based lifeforms. Only those who happen to live at exactly 1 atmosphere of pressure. And ordinary (unpurified) water doesn't freeze at exactly 0 anyway.