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On 2023.OC26, Michael Payne <metricmik...@gmail.com> wrote:
> Water has a density of 1 and 1 litre water has a mass of 1 kg, 1000 L = 1
> m3, mass 1 tonne,
<snip>
Another useful relationship—
Celsius can be considered the percentage of degrees from freezing
(°Fahrenheit−32, °Rankine−491.67), 0°, to the boiling point (of water at 1 atm
pressure—°Fahrenheit−212, °Rankine−671.67), 180°: Freezing can be considered
the opposite of boiling, i.e., antipodal, or 180° apart.
Thus, (e.g.) 68 °F−32 = 36°, or 20% (100×36÷180, or 36÷1.8) from freezing to
boiling, or 20 °C!
Alternatively, Celsius can be considered “half gradians”: 0° = 0ᵍ = 0 °C, 180°
= 200ᵍ = 100(½ᵍ) = 100 °C.
So, 68 °F−32 = 36° = 40ᵍ = 20(½ᵍ) = 20 °C, or 20% from freezing to boiling, and
122 °F−32 = 90° = 100ᵍ = 50(½ᵍ) = 50 °C, or 50% from freezing to boiling.
~Kaimbridge~
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