Celsius
Celsius (ˈsɛlsiəs)
Celsius (also known as centigrade) is a temperature scale used by the International System of Units. As an SI derived unit, it is used by most countries in the world. It is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale.
Etymology
The term "Celsius" comes from the Latinized name of Anders Celsius, a Swedish astronomer who first proposed a similar system in 1742. The term "centigrade" is derived from the Latin centum, meaning hundred, and gradus, meaning steps.
Definition
From 1743 until 1954, 0 °C was defined as the melting point of ice and 100 °C was defined as the boiling point of water under a pressure of one standard atmosphere. This close equivalence is taught in schools today. However, the current definition of the Celsius scale is the Kelvin scale shifted by 273.15 K, so that 0 K (−273.15 °C) is absolute zero, and the triple point of Vienna Standard Mean Ocean Water is defined to be 273.16 K and 0.01 °C.
Related terms
- Fahrenheit: Another scale for temperature measurement, used primarily in the United States.
- Kelvin: The SI base unit of temperature, used in scientific contexts.
- Thermometer: A device used to measure temperature.
- Thermodynamics: The branch of physics that deals with heat and temperature, and their relation to energy, work, radiation, and properties of matter.
External links
- Medical encyclopedia article on Celsius
- Wikipedia's article - Celsius
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