Everything about R Mer Scale totally explained
Rømer is a disused
temperature scale named after the
Danish astronomer Ole Christensen Rømer, who proposed it in
1701.
In this scale, the zero was initially set using freezing
brine. The boiling point of
water was defined as 60 degrees. Rømer then saw that the freezing point of water fell at roughly one eighth of that value (7.5 degrees), so he used that value as the other fixed point. Thus the
unit of this scale, a Rømer degree, is 40/21 of a
kelvin (or of a
Celsius degree). The symbol is sometimes given as
°R, but since that's also sometimes used for the
Rankine scale, the other symbol
°Rø is to be preferred. The name shouldn't be confused with
Réaumur.
A plausible story of how the Fahrenheit scale was invented is that
Daniel Gabriel Fahrenheit learned of Rømer's work and visited him in
1708; he improved on the scale, increasing the number of divisions by a factor of four and eventually establishing what is now known as the
Fahrenheit scale, in
1724.
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