The Rømer scale (Danish pronunciation: [ˈʁœːˀmɐ]; also Roemer) is a temperature scale named after the Danish astronomer Ole Christensen Rømer, who proposed it in 1701. It is based on the freezing point of pure water being 7.5 degrees and the boiling point of water as 60 degrees.
| Definition | Relation to SI units |
|---|---|
| degree Réaumur | degree Rømer | degree Fahrenheit | degree Celsius | degree Kelvin | degree Delisle | degree Newton | degree Rankine |
|---|---|---|---|---|---|---|---|
| 1 | 8.15625 | 34.25 | 1.25 | 274.4 | 148.125 | 0.4125 | 493.92 |
| -9.9047619 | 1 | 9.7142857 | -12.3809524 | 260.7690476 | 168.5714286 | -4.0857143 | 469.3842857 |
| -13.7777778 | -1.5416667 | 1 | -17.2222222 | 255.9277778 | 175.8333333 | -5.6833333 | 460.67 |
| 0.8 | 8.025 | 33.8 | 1 | 274.15 | 148.5 | 0.33 | 493.47 |
| -217.72 | -135.37875 | -457.87 | -272.15 | 1 | 558.225 | -89.8095 | 1.8 |
| 79.4666667 | 59.65 | 210.8 | 99.3333333 | 372.4833333 | 1 | 1 | 670.47 |
| 2.4242424 | 9.0909091 | 37.4545455 | 3.0303030 | 276.1803030 | 145.4545455 | 1 | 497.1245455 |
| -218.0755556 | -135.6120833 | -458.67 | -272.5944444 | 0.5555556 | 558.8916667 | -89.9561667 | 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |
| 1 degrees Rømer | = 1 degrees Kelvin |
| 2 degrees Rømer | = 2 degrees Kelvin |
| 3 degrees Rømer | = 3 degrees Kelvin |
| 4 degrees Rømer | = 4 degrees Kelvin |
| 5 degrees Rømer | = 5 degrees Kelvin |