Fahrenheit
Definition and meaning of Fahrenheit in chemistry.
Fahrenheit is a standard temperature scale used primarily in the United States for everyday weather and cooking. On this specific scale, liquid water freezes at 32 degrees and boils at 212 degrees. These reference points assume a standard atmospheric pressure of exactly one atmosphere at sea level.
In more detail
The German physicist Daniel Gabriel Fahrenheit originally devised this famous temperature scale in the year 1724. His scale cleanly divides the interval between the freezing and boiling points of water into 180 degrees. The Fahrenheit system remains in widespread everyday use throughout the United States and a few other territories.
However, professional chemists rarely utilize the Fahrenheit scale when conducting actual scientific research in the laboratory. Instead, the global scientific community relies heavily on the Celsius and Kelvin scales for taking precise measurements. These scientific scales align perfectly with the base-ten metric system and integrate smoothly into mathematical equations.
Furthermore, the Kelvin scale begins exactly at absolute zero, which makes thermodynamic calculations much more straightforward. Converting a temperature reading between the Fahrenheit and Celsius scales requires both a multiplier and an offset. This mathematical complexity exists because zero degrees Fahrenheit does not correspond to zero degrees on the Celsius scale.
Students sometimes forget that a one-degree change in Fahrenheit is physically smaller than a one-degree change in Celsius. Specifically, nine degrees on the Fahrenheit scale equals exactly five degrees on the Celsius scale. Therefore, temperatures change much faster numerically on the Fahrenheit scale than they do on the Celsius scale.
Key facts
| Field | General Chemistry |
|---|---|
| Symbol | °F |
| Water freezing point | 32 °F (0 °C) |
| Water boiling point | 212 °F (100 °C) |
| Absolute zero | -459.67 °F |
| Scale ratio | 9 °F equals 5 °C |
A normal human body temperature registers at approximately 98.6 degrees on the Fahrenheit temperature scale. You can convert this value to Celsius by first subtracting 32 to get exactly 66.6 degrees. Next, you multiply that result by five and divide by nine to get exactly 37 degrees Celsius.
Frequently asked questions
How do you convert a Fahrenheit temperature into Celsius?
You first subtract 32 from the Fahrenheit temperature, and then you multiply that new result by 5/9.
Why don't scientists use the Fahrenheit scale in chemistry labs?
Scientists prefer Celsius and Kelvin because those scales integrate perfectly with the base-ten metric system used globally.
Is a one-degree change in Fahrenheit the same as Celsius?
No, a one-degree change on the Fahrenheit scale represents a much smaller temperature shift than one degree Celsius.