Rømer to Fahrenheit (°Rø to °F)
1 degree Rømer equals 9.714285714 degrees Fahrenheit.
How to convert degrees Rømer to degrees Fahrenheit
Converting degrees Rømer to degrees Fahrenheit is not a simple multiplication, so use the formula below.
°F = °Rø × 3.428571429 + 6.285714286
Example: 10 degrees Rømer = 40.57142857 degrees Fahrenheit.
Temperature scales have different zero points, so converting is not just multiplication. Differences in degrees convert differently from absolute readings.
About these units
Degree Rømer (°Rø)
An early temperature scale devised by Ole Rømer around 1702: water freezes at 7.5° and boils at 60°. Fahrenheit based his scale on it.
Ole Rømer, the Danish astronomer better known for measuring the speed of light, devised this scale around 1702 for his own use. It is the second temperature scale on record, after Newton's from a year earlier. Water freezes at 7.5 degrees and boils at 60 degrees, so one degree equals 40/21 of a Celsius degree, about 1.905 degrees Celsius.
The odd 7.5 may come from his earlier choice of a lower fixed point, the cold of ammonium chloride brine. He apparently found that the freezing point of water lay about one eighth of the way up from that mark to boiling and moved the scale accordingly, though his exact reasoning is unknown.
Daniel Fahrenheit visited him in Copenhagen in 1708 and by 1713 was making thermometers on a scale largely borrowed from Rømer. He shifted freezing from 7.5 to 8 and quartered each degree, which gave 32 degrees. Rømer's notebook was only published in 1910.
0 degrees Rømer = 258.8642857 kelvins (approximately).
Sources: Wikipedia: Rømer scale; Wikipedia: Ole Rømer
Degree Fahrenheit (°F)
The temperature scale used in the United States and a few other countries: water freezes at 32 °F and boils at 212 °F. Proposed by Daniel Gabriel Fahrenheit in 1724.
Daniel Gabriel Fahrenheit, who lived from 1686 to 1736, proposed his scale in 1724. His zero came from a freezing mixture of ice, water and ammonium chloride (or sea salt), which holds a stable temperature, and his upper reference of about 96 was his estimate of human body temperature. His own letters say he built on Ole Rømer's scale. Accounts of how he picked zero differ, and a popular German story that it was the coldest winter day in his home city of Danzig has failed verification.
Around 1776 to 1777 a Royal Society committee led by Henry Cavendish fixed water's freezing point at 32 degrees and its boiling point at 212, exactly 180 degrees apart, which moved body temperature to about 98.6. Today the scale is defined through the kelvin; NIST puts absolute zero at minus 459.67 degrees Fahrenheit. It remains in everyday use in the United States and its territories, Palau, the Federated States of Micronesia, the Marshall Islands and the Cayman Islands. A comfortable room is around 70 degrees, which is about 21 degrees Celsius.
0 degrees Fahrenheit = 255.3722222 kelvins (approximately).
Sources: Wikipedia: Fahrenheit; NIST: the kelvin and the SI redefinition; NIST Guide to the SI, Appendix B.8: conversion factors
Related conversions
- Fahrenheit to Rømer (reverse)
- Rømer to kelvin
- Rømer to Celsius
- Kelvin to Fahrenheit
- Celsius to Fahrenheit
- Rankine to Fahrenheit
- Réaumur to Fahrenheit
- Delisle to Fahrenheit
- Newton to Fahrenheit
See all temperature units.