Celsius
Definition
The Celsius is a SI unit of temperature. It relates to the Kelvin, and there is a one degree change in Celsius for every degree change in Kelvin. The Celsius and Kelvin scales are related by Planck's constant (h) and Boltzmann's constant (k), which equals 1.380649 × 10-23 when expressed in J·K-1 units.
Origin
The use of the Celsius scale as a unit and a scale was rare until an original definition for zero degrees Celsius as the boiling point of water, and 100 degrees Celsius as the melting point of snow, was reversed. In 1954, the degree Celsius—along with the Celsius system—was again defined to be by absolute zero (-273.15 °C) and one second per square meter at 0 Kelvin (VSMOW). This is still the current-day definition used in 2019. However, the kelvin itself was re-defined in 2019, based on the definitions of meters per square second and grams per cubic meter.
Current use
Most countries in the world have replaced the Fahrenheit scale with Celsius in recent decades. All countries use this temp unit, except for those that haven't converted to the metric system, like the United States. Within scientific communities such as the United States, Celsius is often used over Fahrenheit, even though it's less popular to talk about everyday temperature.
Kelvin
Definition
The kelvin is the base unit of thermodynamic temperature on the International System of Units (SI). It is defined as the energy equivalent to the triple point of water, and it's also used on the Kelvin scale. The term kelvin was officially changed in 2019, which resulted in a fundamental change in its definition.
Origin
Kelvin is a temperature scale named after the British physicist William Thomson, better known as Lord Kelvin. In 1848, he wrote an essay outlining the need for an absolute temperature scale and calculated that absolute zero was -273°C with only a 0.15°C deviation from the current accepted value.
Until late 2018, the kelvin was defined as 1/273.16 of the thermodynamic temperature of the triple point of water (0.01°C or 32.018°F). Designated in 1954, the Kelvin scale's second defining point is the triple point of water and 273.16 K is exactly 0.01°C or 32.018°F.
The definition of the Kelvin changed this year, but its usage and relationships to other temperature scales and units haven't changed.
Current use
The Kelvin scale is used in science and construction, while Celsius is generally used in other contexts. The Kelvin and Celsius scales are exact opposites of each other, with the same magnitude, though not necessarily the same value. Unlike Celsius and Fahrenheit, Kelvin is rarely used in meteorological contexts.
Celsius to Kelvin Conversion Table
Celsius [°C] Kelvin [K]
0.01 °C 273.16 K
0.1 °C 273.25 K
1 °C 274.15 K
2 °C 275.15 K
3 °C 276.15 K
5 °C 278.15 K
10 °C 283.15 K
20 °C 293.15 K
50 °C 323.15 K
100 °C 373.15 K
1000 °C 1273.15 K
How to Convert Celsius to Kelvin
K = C + 273.15
C = K - 273.15
Example: Convert 15 °C to K
15 °C = 15 + 273.15 = 288.15 K
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