What does Fahrenheit mean?

Fahrenheitscale refers to the unit used to measure temperature, symbol ℉. Fahrenheit = 32 + Celsius × 1.8.

Only 5 countries in the world use Fahrenheit, including the Bahamas, Belize, the British Cayman Islands, Palau, the United States of America and its affiliated territories (Puerto Rico, Guam, and the U.S. Virgin Islands) . Fahrenheit (°F) is a unit of measurement for temperature, named after its inventor, the German Gabriel Daniel Fahrenheit (1686-1736).

In 1724, he discovered that liquid metal mercury was more suitable for making thermometers than alcohol. He used mercury as the temperature measurement medium and invented the glass mercury thermometer. The freezing point temperature of the mixture of ammonium chloride and ice water was selected as the zero degree of the thermometer. , the human body temperature is 100 degrees on the thermometer. Under standard atmospheric pressure, the melting point of ice is 32℉ and the boiling point of water is 212℉. There are 180 equal parts in between. Each equal part is 1 degree Fahrenheit, recorded as "1℉".

Background of the development of the Fahrenheit scale:

Until the 1960s, the Fahrenheit scale was the primary temperature standard used in English-speaking countries for climatic, industrial, and medical purposes. In the late 1960s and 1970s, the Celsius scale replaced the Fahrenheit scale in almost all of these countries (except the United States and, in some cases, the United Kingdom), usually within their general metric system.

The Fahrenheit scale is used for daily applications in the United States, its territories and associated states (all served by the National Weather Service), as well as the Cayman Islands and Liberia. For example, U.S. weather forecasts, food cooking and freezing temperatures are often measured in degrees Fahrenheit. Scientists, including meteorologists, use degrees Celsius or Kelvin in all countries.

Already in the 20th century, Halsey and Dale suggested that reasons for U.S. opposition to the use of the Celsius (now Celsius) system included the larger size of each degree Celsius and the lower zero point in the Fahrenheit system.

Canada passed legislation supporting the International System of Units while retaining the legal definition of traditional Canadian Imperial units. Weather reports in Canada are in Celsius, with occasional reference to Fahrenheit, especially for cross-border broadcasts. Almost all Canadian ovens still use Fahrenheit. Digital and analog thermometers sold in Canada usually have both Celsius and Fahrenheit scales.

Reference for the above content: Baidu Encyclopedia-Fahrenheit