Comparison of temperature scales
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Table of selected pointsEdit
The following table gives a comparison of the numerical value of temperatures on a number of different scales:
Kelvin | Celsius | Fahrenheit | Rankine | Delisle | Newton | Réaumur | Rømer | |
---|---|---|---|---|---|---|---|---|
Absolute zero | 0 | −273.15 | −459.67 | 0 | 559.725 | −90.14 | −218.52 | −135.90 |
Fahrenheit's ice/salt mixture | 255.37 | −17.78 | 0 | 459.67 | 176.67 | −5.87 | −14.22 | −1.83 |
Water freezes (at standard pressure) | 273.15 | 0 | 32 | 491.67 | 150 | 0 | 0 | 7.5 |
Average human body temperature (See note below) | 310.0 | 36.8 | 98.2 | 557.9 | 94.5 | 12.21 | 29.6 | 26.925 |
Water boils (at standard pressure) | 373.15 | 100 | 212 | 671.67 | 0 | 33 | 80 | 60 |
Titanium melts | 1941 | 1668 | 3034 | 3494 | −2352 | 550 | 1334 | 883 |
The surface of the Sun | 5800 | 5526 | 9980 | 10440 | −8140 | 1823 | 4421 | 2909 |
Note: Normal human body temperature is 36.8 °C ±0.7 °C, or 98.2 °F ±1.3 °F. The commonly given value 98.6 °F is simply the exact conversion of 37 °C, and therefore has excess (invalid) precision. Some numbers in this table have been rounded off.
Formulas for conversionEdit
Given any two fixed points, the formula for conversion between any two scales in the table above can be determined. If two rows and two columns appar as:
Scale X | Scale Y | |
---|---|---|
Fixed point 1 | a | b |
Fixed point 2 | c | d |
the formula can be derived:
where
and
- .