Rømer scale

The Rømer (also spelled Roemer ) is a scale of Température worked out by the Astronome, Physicien and manufacturer of Danish measuring instruments Ole Christensen Rømer in 1701.

In 1701, Isaac Newton (1642 - 1727) had suggested that the average temperature of the human body and the freezing point of water are used as fixed points to gauge the thermometers. Rømer did not publish the method which it used (or these notes perished in the fire of Copenhagen of 1728), but in 1708 Daniel Gabriel Fahrenheit visited it, looked at it working, and consigned its observations.

The zero would initially have been established by the freezing point of a brine of water, ice and Chlorure of ammonium. The point of boiling of the Eau was then fixed at 60 degrees. Rømer noted whereas the freezing point of water fell in the neighborhoods from the eighth from this value (7,5 degrees), also used it this value like second fixed point. Thus the unit of this scale, the Rømer degree, is worth 40/21 of a Kelvin (or of a Degree Celsius).

Fahrenheit improved the scale, increasing inter alia the number of divisions and establishes in 1724 the scale which bears its name now: the degree Fahrenheit.

The symbol is sometimes given as being °R , but this symbol is also sometimes used for the degree Rankine; it is thus necessary to prefer the other symbol °Rø .

Other scales

External bonds

Conversion of dismantles Rømer towards other units of temperature

Random links: