Kelvin to Newton
K
N
Conversion History
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Quick Reference Table (Kelvin to Newton)
| Kelvin (K) | Newton (N) |
|---|---|
| 0 | -90.1395 |
| 255 | -5.9895 |
| 273 | -0.0495 |
| 293 | 6.5505 |
| 310 | 12.1605 |
| 373 | 32.9505 |
About Kelvin (K)
The kelvin (K) is the SI base unit of thermodynamic temperature. Unlike Celsius and Fahrenheit it has no degree symbol — temperatures are written "310 K", not "310°K". Kelvin is an absolute scale: 0 K is absolute zero, the theoretical lower bound of temperature where molecular motion effectively ceases. Since the 2019 SI redefinition, the kelvin is fixed by the Boltzmann constant (k = 1.380649 × 10⁻²³ J/K). Kelvin and Celsius share the same degree size — a change of 1 K equals a change of 1°C — making conversion straightforward: K = °C + 273.15. Kelvin is used in physics, chemistry, astronomy, and engineering thermodynamics.
The surface of the Sun is approximately 5,778 K. Liquid nitrogen boils at 77 K (−196°C). The cosmic microwave background temperature is 2.725 K.
Etymology: Named after William Thomson, 1st Baron Kelvin (1824–1907), the Irish-Scottish mathematical physicist who first proposed an absolute temperature scale in 1848. He was ennobled as Baron Kelvin of Largs in 1892, after the River Kelvin in Glasgow near where he worked.
About Newton (N)
The Newton scale is an obsolete historical temperature scale proposed by Isaac Newton around 1701, predating both Celsius and Fahrenheit. It sets 0°N at the freezing point of water and 33°N at the boiling point — a 33-degree span. Newton chose 33 because it divides cleanly into thirds and twelfths, reflecting duodecimal arithmetic conventions of the time. Body temperature is approximately 12.2°N. Newton calibrated his scale using linseed oil as the thermometric fluid. His scale influenced later thermometrists but was never widely adopted and is today of primarily historical and educational interest, appearing in scientific history discussions and temperature conversion tools.
Body temperature (37°C) is approximately 12.2°N on Newton's scale. A warm summer day of 25°C equals about 8.25°N.
Etymology: Proposed by Isaac Newton (1643–1727) in his 1701 paper "Scala Graduum Caloris" (Scale of the Degrees of Heat), published anonymously in Philosophical Transactions. Newton used a linseed oil thermometer and calibrated it against the freezing point of water and body temperature, later extending it to a second reference at the boiling point.
Kelvin – Frequently Asked Questions
How close to absolute zero have scientists actually gotten?
In 2021, researchers at the University of Bremen cooled rubidium atoms to 38 picokelvin (38 trillionths of a kelvin above absolute zero) inside a drop tower — the coldest temperature ever achieved. At these extremes, atoms form a Bose–Einstein condensate where quantum effects become visible at macroscopic scales. True 0 K is impossible to reach (the third law of thermodynamics forbids it), but each new record pushes closer, enabling research into superfluidity, quantum computing, and exotic states of matter.
Why do scientists use kelvin instead of Celsius?
Scientific calculations in thermodynamics, astrophysics, and chemistry require an absolute scale with no negative values. Many physical laws — the ideal gas law (PV = nRT), Wien's displacement law, Stefan–Boltzmann law — only work correctly with absolute temperature. Using Celsius would require constant offsets of 273.15.
What is the difference between kelvin and Celsius?
Kelvin and Celsius have identical degree sizes, so a temperature difference of 5 K equals a difference of 5°C. The only difference is the zero point: 0 K = −273.15°C. To convert: K = °C + 273.15. Kelvin has no negative values; Celsius does.
What everyday temperatures are expressed in kelvin?
Kelvin is rarely used in everyday life but appears in lighting (color temperature — a warm white bulb is around 3,000 K, daylight is 6,500 K), industrial processes, cryogenics (liquid helium: 4.2 K; liquid nitrogen: 77 K), and the specification of laser wavelengths and scientific instruments.
What is the coldest naturally occurring temperature in the universe?
The Boomerang Nebula, a protoplanetary nebula about 5,000 light-years away, has a measured temperature of approximately 1 K (−272°C), making it the coldest known naturally occurring place in the universe — colder than the cosmic microwave background (2.725 K).
Newton – Frequently Asked Questions
Who invented the Newton temperature scale?
Isaac Newton proposed the scale in 1701 in his paper "Scala Graduum Caloris", published anonymously in Philosophical Transactions of the Royal Society. He used a linseed oil thermometer and calibrated it against the freezing point of water and body temperature as fixed reference points.
What are the reference points of the Newton scale?
0°N is the freezing point of water and 33°N is the boiling point of water, giving a 33-degree range. Newton also used body temperature (approximately 12°N) and "the greatest summer heat" as intermediate calibration points. These are the same two endpoints used by later scales, just with different degree spans.
Why did Newton choose 33 degrees for boiling water?
Newton chose 33 because it factors neatly: 33 = 3 × 11, and one-third of 33 (11°N) corresponds approximately to body temperature in his calibration. The choice reflects his preference for divisions into thirds and twelfths, common in pre-metric scientific notation, rather than the decimal basis used by Celsius.
How does the Newton scale compare to Celsius?
Newton and Celsius share the same zero (freezing water = 0), but Newton's boiling point is 33°N versus 100°C. To convert: °N = °C × 33/100 (or × 0.33). Room temperature (20°C) is 6.6°N; body temperature (37°C) is 12.21°N.
Is the Newton temperature scale still used today?
No. The Newton scale was never widely adopted and fell out of use by the mid-18th century as Fahrenheit and Celsius became dominant. It survives today only in historical accounts of thermometry and in temperature conversion tools as an educational curiosity about the origins of quantitative temperature measurement.