According to a letter Fahrenheit wrote to his friend Herman Boerhaave,[12] his scale was built on the work of Ole Rømer, whom he had met earlier. In Rømer's scale, brine freezes at zero, water freezes and melts at 7.5 degrees, body temperature is 22.5, and water boils at 60 degrees. Fahrenheit multiplied each value by four in order to eliminate fractions and increase the granularity of the scale. He then re-calibrated his scale using the melting point of ice and normal human body temperature (which were at 30 and 90 degrees); he adjusted the scale so that the melting point of ice would be 32 degrees and body temperature 96 degrees, so that 64 intervals would separate the two, allowing him to mark degree lines on his instruments by simply bisecting the interval six times (since 64 is 2 to the sixth power).[10][13]

Fahrenheit observed that water boils at about 212 degrees using this scale. Later, other scientists[who?] decided to redefine the scale slightly to make the freezing point exactly 32 °F, and the boiling point exactly 212 °F or 180 degrees higher.[citation needed] It is for this reason that normal human body temperature is approximately 98° (oral temperature) on the revised scale (whereas it was 90° on Fahrenheit's multiplication of Rømer, and 96° on his original scale).[14]

Oops, I remembered part of it incorrectly. There was still logic involved though.
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Fahrenheit proposed his temperature scale in 1724, basing it on three reference points of temperature.[7] In his initial scale (which is not the final Fahrenheit scale), the zero point is determined by placing the thermometer in brine: he used a mixture of ice, water, and ammonium chloride, a salt, at a 1:1:1 ratio. This is a frigorific mixture which stabilizes its temperature automatically: that stable temperature was defined as 0 °F (−17.78 °C). The second point, at 32 degrees, was a mixture of ice and water without the ammonium chloride at a 1:1 ratio. The third point, 96 degrees, was approximately the human body temperature, then called "blood-heat".[10]

According to a story and trivia question in Germany, Fahrenheit actually chose the lowest air temperature measured in his hometown Danzig in winter 1708/09 as 0 °F, and only later had the need to be able to make this value reproducible using brine.[11] This is one explanation given why 0 °F is −17.78 °C, but the ammonium chloride cooling temperature actually is –3°C, whereas that of NaCl is −21.1 °C; the other explanation is that he did not have a good enough brine solution to obtain the eutectic equilibrium exactly (i.e. he might have had a mixture of salts, or it had not fully dissolved). In any case, the definition of the Fahrenheit scale has changed since.

According to a letter Fahrenheit wrote to his friend Herman Boerhaave,[12] his scale was built on the work of Ole Rømer, whom he had met earlier. In Rømer's scale, brine freezes at zero, water freezes and melts at 7.5 degrees, body temperature is 22.5, and water boils at 60 degrees. Fahrenheit multiplied each value by four in order to eliminate fractions and increase the granularity of the scale. He then re-calibrated his scale using the melting point of ice and normal human body temperature (which were at 30 and 90 degrees); he adjusted the scale so that the melting point of ice would be 32 degrees and body temperature 96 degrees, so that 64 intervals would separate the two, allowing him to mark degree lines on his instruments by simply bisecting the interval six times (since 64 is 2 to the sixth power).[10][13]

Fahrenheit observed that water boils at about 212 degrees using this scale. Later, other scientists[who?] decided to redefine the scale slightly to make the freezing point exactly 32 °F, and the boiling point exactly 212 °F or 180 degrees higher.[citation needed] It is for this reason that normal human body temperature is approximately 98° (oral temperature) on the revised scale (whereas it was 90° on Fahrenheit's multiplication of Rømer, and 96° on his original scale).[14]

Thank you for the article I was wondering what early thing it was

B-b-but my FEELINS' !

okay then.

you should've said "felines" because the picture has a cat...

sounds like a stretch, but maybe if i said Feelines.

I love you.

I'm flattered, but we just met.

B-b-but my FEELINS' !

okay then.

you should've said "felines" because the picture has a cat...

sounds like a stretch, but maybe if i said Feelines.