Romer is a temperature scale named after the Danish astronomer Ole Christensen Romer, 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.
This scale confirms to the following characteristics under the standard atmospheric pressure:
- the boiling point of water is defined at 60 degrees;
- the zero of the scale was originally set to the temperature of freezing brine;
- the freezing point of water is defined at 7.5 degrees above the zero of the scale;
- a Romer degree is 100/52.5 = 40/21 of a Kelvin or Celsius degree.