# Kelvin to Delisle (K to °De) Source: https://www.unitconvertercalculator.com/temperature/kelvin-to-delisle/ To convert Kelvin to Delisle, use the formula: De = (373.15 - K) x 3/2. The Kelvin scale is the absolute SI temperature unit used in science worldwide, while the Delisle scale is the inverted 18th-century Russian scale. Water freezes at 273.15 degrees K (150 De) and boils at 373.15 degrees K (0 De). ## Formula K via Kelvin to °De ## Conversion Table | Kelvin (K) | Delisle (°De) | |---|---| | 0 K | 559.725 °De | | 4 K | 553.725 °De | | 20 K | 529.725 °De | | 77 K | 444.225 °De | | 100 K | 409.725 °De | | 173 K | 300.225 °De | | 200 K | 259.725 °De | | 233 K | 210.225 °De | | 253 K | 180.225 °De | | 273.15 K | 150 °De | | 293 K | 120.225 °De | | 298 K | 112.725 °De | | 300 K | 109.725 °De | | 310 K | 94.725 °De | | 373.15 K | 0 °De | | 400 K | -40.275 °De | | 500 K | -190.275 °De | | 1000 K | -940.275 °De | | 5000 K | -6940.275 °De | | 10000 K | -14440.275 °De | ## Units ### Kelvin (K) The SI base unit of temperature. 0 K is absolute zero, the theoretical lowest possible temperature. Used in science and engineering. ### Delisle (°De) A historical inverted temperature scale invented by Joseph-Nicolas Delisle in 1732. Water boils at 0 °De and freezes at 150 °De. Higher numbers mean colder temperatures. ## Background The Kelvin scale was created by Lord Kelvin (William Thomson), 1848, the SI standard for thermodynamics. The Delisle scale was created by Joseph-Nicolas Delisle, French astronomer, 1732, used in Russia. Converting between them bridges different eras and different measurement philosophies in the history of thermometry. ## Good to Know The history of temperature measurement is the history of scientific collaboration and competition across borders. The Kelvin scale (the SI standard for thermodynamics) and the Delisle scale (used in Russia) represent different national contributions to solving the same fundamental problem: how to assign numbers to the sensation of hot and cold. ## FAQ ### How do you convert Kelvin to Delisle? Use the formula De = (373.15 - K) x 3/2. At the freezing point of water: 273.15 K = 150 De. At the boiling point: 373.15 K = 0 De. ### When would you need to convert Kelvin to Delisle? This conversion is needed when interpreting historical scientific records, comparing temperature data across different measurement traditions, or completing engineering calculations that mix temperature scales from different national standards. ### What are the key reference points for both scales? Water freezes at 273.15 K = 150 De. Water boils at 373.15 K = 0 De. These two fixed points anchor both scales and provide easy verification of any conversion calculation. ## Non-Frequently Asked Questions ### Is converting Kelvin to Delisle like driving in reverse on a highway? In a sense, yes. Kelvin counts up from absolute zero; Delisle counts down from boiling water. Converting between them requires reversing direction, which is arithmetically simple but conceptually disorienting. Every time the Kelvin value increases, the Delisle value decreases. It is the measurement equivalent of a mirror-image highway. ### What is absolute zero in Delisle degrees? Absolute zero (0 Kelvin) equals 559.725 degrees Delisle. This absurdly high Delisle number for the universe's coldest possible temperature is the ultimate demonstration of why inverted scales confuse people. In Delisle, the most extreme cold gets the biggest number - the opposite of every intuitive expectation about temperature. ### Did any scientist ever publish results in both Kelvin and Delisle? Almost certainly not. Kelvin was formalized in 1848, by which time Delisle had been abandoned in Russia for several decades. The two scales never coexisted as active scientific standards. 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