Celsius
Definition
The Celsius is a temperature system created for the International System of Units. It's a unit based on the kelvin and its measurement is defined by the Boltzmann constant, which equals 1.380649 × 10-23 in the unit J·K-1. Other base units in SI are the kilogram, meter, and second.
Origin
The Celsius scale was originally based on the melting point of snow and defined as 100°C, but in 1954 it was re-based at the boiling point of water and changed to 0°C. However, in 2019 the kelvin was redefined from absolute zero (-273.15 °C) and the triple point of VSMOW (a purified water), using a definition that is based on the original Celsius definition of freezing point being 0°C and melting point being 100°C.
Current use
The Celsius scale replaced the Fahrenheit scale in most countries decades ago. The exception being those that do not use metric measurements—such as in the United States. Even in countries that don't use the metric system, such as the United States, Celsius is used within the scientific community and is becoming more mainstream day by day.
Fahrenheit
Definition
The Fahrenheit is a temperature unit that's typically used for things like gas ovens and thermostats. It may not be as popular as the Celsius, but it's often used for cooking and scientific research. The symbol for Fahrenheit is °F, which stands for degrees of freedom from the freezing point of water.
Origin
The Fahrenheit scale is a temperature scale created by the German physicist Daniel Gabriel Fahrenheit in 1724. The original system was based on an equal ice-salt mixture, but he later adjusted the scales such that water's melting point was 32°F and body temperature 96°F. This simplified the degrees between each mark he could make, because there was a 6 degree difference between these creations. He also then slightly changed it to 180 degrees, with normal human body temperature at 98°F instead of the old 96°F.
Current use
The Fahrenheit temperature scale was used in English-speaking countries until the 1960s. Today, most countries around the world use the Celsius temperature scale instead and have made the change during a metric conversion process. However, Fahrenheit is still used primarily in the United States, as well as its unincorporated territories, the Bahamas, Belize, and others.
Celsius to Fahrenheit Conversion Table
Celsius [°C] Fahrenheit [°F]
0.01 °C 32.018 °F
0.1 °C 32.18 °F
1 °C 33.8 °F
2 °C 35.6 °F
3 °C 37.4 °F
5 °C 41 °F
10 °C 50 °F
20 °C 68 °F
50 °C 122 °F
100 °C 212 °F
1000 °C 1832 °F
How to Convert Celsius to Fahrenheit
F = 9/5C + 32
C = 5/9(F - 32)
Example: convert 15 °C to °F:
15 °C = 15 × 9/5 + 32 = 59 °F
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