Absolute zero: A temperature so low that it cannot be reached, because of the third law of thermodynamics
10−12
1 pK
38+6 −7 pK, lowest laboratory-produced temperature, achieved through matter-wave lensing of rubidium Bose-Einstein condensates.
450 pK, lowest temperature sodium Bose–Einstein condensate gas ever achieved in the laboratory, at MIT
10−9
1 nK
50 nK, Fermi temperature of potassium-40
Critical temperature of alkali Bose–Einstein condensates
10−6
1 μK
Nuclear demagnetization
Doppler-cooled refrigerants in laser cooling and magneto-optical traps
10−3
1 mK
1.7 mK, temperature record for helium-3/helium-4 dilution refrigeration, and the lowest temperature which may be sustained for arbitrarily long time with known techniques.
2.5 mK, Fermi melting point of helium-3
60 mK adiabatic demagnetization of paramagnetic molecules
300 mK in evaporative cooling of helium-3
700 mK, helium-3/helium-4 mixtures begin phase separation
950 mK, melting point of helium at 2.5 megapascals of pressure. All 118 elements are solid at or below this temperature.
Energy equivalent to a microwave photon
1
1 K
1 K at the Boomerang Nebula, the coldest natural environment known
1.5 K, melting point of overbound helium
2.19 K, lambda point of overbound superfluid helium
2.725 K, cosmic microwave background
4.1 K, superconductivity point of mercury
4.22 K, boiling point of bound helium
5.19 K, critical temperature of helium
7.2 K, superconductivity point of lead
9.3 K, superconductivity point of niobium
101
10 K
Fermi melting point of valence electrons for superconductivity
14.01 K, melting point of bound hydrogen
20.28 K, boiling point of bound hydrogen
33 K, critical temperature of hydrogen
44 K mean on Pluto
53 K mean of Neptune
63 K, melting point of bound nitrogen
68 K mean of Uranus
77.35 K, boiling point of bound nitrogen
90.19 K, boiling point of bound oxygen
92 K, superconductivity point of Y–Ba–Cu–oxide (YBCO)
165 K, glass transition temperature of supercooled water
1043 K Curie temperature of iron (point at which iron transitions from ferromagnetic to paramagnetic behavior and loses any permanent magnetism)
1170 K at wood fire
1300 K in lava flows, open flames
1500 K in basalt lava flows
c. 1670 K at blue candle flame
1811 K, melting point of iron (lower for steel)
1830 K in Bunsen burner flame
1900 K at the Space Shuttle orbiter hull in 8 km/s dive
2022 K, boiling point of lead
2074 K, surface temperature of the coolest star, 2MASS J0523-1403
2230 K, Debye temperature of carbon
2320 K at open hydrogen flame
2150–2450 K at open hydrocarbon flame
2900 K, color temperature of halogen lamps, black-body radiation maximum at 1000 nm
3695 K, melting point of tungsten
3915 K, sublimation point of carbon
4231 K, melting point of hafnium carbide
4800 K, 10 MPa, triple point of carbon
5000 K, 12 GPa melting point of diamond
5100 K in cyanogen–dioxygen flame
5516 K at dicyanoacetylene (carbon subnitride)–ozone flame
5650 K at Earth's Inner Core Boundary
5780 K on surface of the Sun
5933 K, boiling point of tungsten
6000 K, mean of the Universe 300,000 years after the Big Bang
7445 K, 850 GPa; 8750 K, 520 GPa; 5400 K, 220 GPa, critical point of diamond/solid III
7735 K, a monatomic ideal gas has one electron volt of kinetic energy
8000 K, routinely sustainable temperature in an analytical inductively coupled plasma
8801 K, 10.56 GPa 7020.5 K, 797 MPa, critical point of carbon
Anionic sparks
104
10 kK
10 kK on Sirius A
10–15 kK in mononitrogen recombination
15.5 kK, critical point of tungsten
25 kK, mean temperature of the universe 10,000 years after the Big Bang
26 kK on the white dwarf Sirius B
28 kK in record cationic lightning over Earth
29 kK on surface of Alnitak (easternmost star of Orion's belt)
4–8–40–160 kK[clarification needed] on white dwarfs
30–400 kK on a planetary nebula's asymptotic giant helium star
36 kK boundary between inner and outer core within Jupiter
37 kK in proton–electron reactions
38 kK on Eta Carinae
46 kK on Wolf–Rayet star R136a1
50 kK at protostar (core)
54.5 kK on ON2 III(f*) star LH64-16
>200 kK in Butterfly Nebula
Fermi boiling point of valence electrons
106
1 MK
0.8 MK in solar wind
1 MK inside old neutron stars, brown dwarfs, and at gravital deuterium fusion range
1–3–10 MK[clarification needed] above Sun (corona)
2.4 MK at T Tauri stars and gravital lithium-6 fusion range
2.5 MK at red dwarfs and gravital protium fusion range
10 MK at orange dwarfs and gravital helium-3 fusion range
15.6 MK at Sun's core
10–30–100[clarification needed] MK in stellar flares
20 MK in novae
23 MK, beryllium-7 fusion range
60 MK above Eta Carinae
85 MK (15 keV) in a magnetic confinement fusion plasma
200 MK at helium star and gravital helium-4 fusion range
230 MK, gravital carbon-12 fusion range
460 MK, gravital neon fusion–disproportionation range
5–530 MK in Tokamak Fusion Test Reactor's plasma
750 MK, gravital oxygen fusion range
109
1 GK
1 GK, everything 100 seconds after the Big Bang
1.3–1.7 GK, gravital silicon fusion range
3 GK in electron–positron reactions
10 GK in supernovae
10 GK, everything 1 second after the Big Bang
700 GK in quasars' accretion discs
740 GK, Hagedorn temperature or Fermi melting point of pions
1012
1 TK
0.1–1 TK at new neutron star
~1 TK, critical temperature to form quark–gluon plasma
3–5 TK in proton–antiproton reactions
5.5 TK, highest man-made temperature, in a quark–gluon plasma from LHC collisions
10 TK, 100 microseconds after the Big Bang
45–67 TK at collapsar of a gamma-ray burst
300–900 TK at proton–nickel conversions in the Tevatron's Main Injector[clarification needed]
1015
1 PK
0.3–2.2 PK at proton–antiproton collisions
2.8 PK within an electroweak star
1018
1 EK
1021
1 ZK
1024
1 YK
0.5–7 YK at ultra-high-energy cosmic ray collisions
1027
1 RK
Everything 10−35 seconds after the Big Bang
1030
1 QK
Hagedorn temperature of strings
1032
100 QK
142 QK, Planck temperature
10290
10260 QK
Landau pole of quantum electrodynamics
Detailed list for 100 K to 1000 K
Most ordinary human activity takes place at temperatures of this order of magnitude. Circumstances where water naturally occurs in liquid form are shown in light grey.
Kelvin
Degrees Celsius
Degrees Fahrenheit
Condition
100 K
−173.15 °C
−279.67 °F
133 K
−140 °C
−220 °F
Mean on Saturn
133 K to 163 K
−140 to −110 °C
−220 to −160 °F
Typical temperature of a whole-body cryotherapy chamber
163 K
−110 °C
−166 °F
Mean on Jupiter
165 K
−108 °C
−163 °F
Glass transition temperature of supercooled water (Debatable)
175.4 K
−97.8 °C
−144 °F
Coldest luminance temperature recorded on Earth (measured remotely by satellite), in Antarctica
183.7 K
−89.5 °C
−129.1 °F
Freezing/melting point of isopropyl alcohol
183.9 K
−89.2 °C
−128.6 °F
Coldest officially recorded air temperature on Earth, at Vostok Station, Antarctica on 1983-07-21 01:45 UTC
192 K
−81 °C
−114 °F
Debye temperature of ice
193 to 203 K
−80 to −70 °C
−112 to −94 °F
Typical temperature of a ULT freezer
194.6 K
−78.5 °C
−109.3 °F
Sublimation point of carbon dioxide (dry ice)
203.55 K
−69.6 °C
−93.3 °F
Coldest officially recorded air temperature in the Northern Hemisphere at Klinck AWS, Greenland (Denmark) on 1991-12-22
205.5 K
−67.7 °C
−89.9 °F
Coldest officially recorded air temperature on the Eurasian continent at Oymyakon, USSR on 6 February 1933[full citation needed]
210 K
−63 °C
−80 °F
Mean on Mars
214.9 K
–58.3 °C
–72.9 °F
Coldest annual mean temperature on Earth, at Dome Argus, Antarctica[full citation needed]
223.15 K
−50 °C
−58 °F
Mean on Earth during Snowball Earth period[full citation needed] around 650 million years ago
224.8 K
−48.4 °C
−55.0 °F
Coldest temperature that water can remain a liquid (see Supercooling)
225 K
−48 °C
−55 °F
Freezing/melting point of cottonseed oil
233.15 K
−40 °C
−40 °F
Point of coincidence of the Celsius and Fahrenheit temperature scales
Skin may freeze almost instantly at or below this temperature[full citation needed]
234.3 K
−38.83 °C
−37.89 °F
Freezing/melting point of mercury
240.4 K
−32.8 °C
−27.0 °F
Coldest air temperature recorded in South America, at Sarmiento, Argentina on 1907-06-01
246 K
−27 °C
−17 °F
Approximate average yearly temperature on Mount Everest
249 K
–24 °C
–11 °F
Freezing/melting point of flax seed oil
249.3 K
–23.9 °C
–11.0 °F
Coldest air temperature recorded in Africa, at Ifrane, Morocco on 11 February 1935
250 K
–23 °C
–9 °F
Coldest air temperature recorded in Australia, at Charlotte Pass, New South Wales, Australia on 1994-06-29
255.37 K
–17+7⁄9 °C
0 °F
Coldest brine–ice solution found by Daniel Gabriel Fahrenheit
255 K
–18 °C
0 °F
Freezing/melting point of almond oil
Typical temperature of a household freezer
256 K
–17 °C
1 °F
Freezing/melting point of sunflower oil
256 K
–17 °C
2 °F
Freezing/melting point of safflower oil
257 K
–16 °C
3 °F
Freezing/melting point of soybean oil[full citation needed]
262 K
−11 °C
12 °F
Freezing/melting point of corn oil[full citation needed]
263.15 K
–10 °C
14 °F
Freezing/melting point of canola oil
Freezing/melting point of grape seed oil[full citation needed]
265 K
–8 °C
18 °F
White frost can form below this temperature
Freezing/melting point of hemp seed oil[full citation needed]
265.8 K
–7.2 °C
19 °F
Freezing/melting point of bromine
267 K
–6 °C
21 °F
Freezing/melting point of olive oil
Freezing/melting point of sesame oil
271.15 K
−2 °C
28.4 °F
Average freezing/melting point of oceans, the salinity is around 3.47%.
273.14 K
-0.01 °C
31.98 °F
Maximum temperature of an object causing frostbite
273.15 K
0.00 °C
32.00 °F
Freezing/melting point of fresh water (at 1 atm pressure)
273.16 K
0.01 °C
32.02 °F
Triple point of fresh water
276 K
3 °C
37 °F
Freezing/melting point of peanut oil
277 K
3.85 °C
39 °F
Typical temperature of a household refrigerator
277.13 K
3.98 °C
39.16 °F
Water is at maximum density[full citation needed]
279.8 K
6.67 °C
44 °F
Threshold of skin numbness if skin reaches this temperature
283.2 K
10 °C
50 °F
Minimum temperature for most plant growth (see Growing degree-day)
286.9 K
12.7 °C
54.9 °F
Coldest body temperature of a human that survived accidental hypothermia (a 2-year-old boy in Racławice, Poland, on November 30, 2014)
287.6 K
14.44 °C
58 °F
Cold threshold of pain if skin reaches this temperature
288 K
15 °C
59 °F
Mean on Earth
291.6 K
18.4 °C
65.1 °F
Hottest temperature in Antarctica, recorded on 2020 February 6 at the Esperanza Base
294 K
21 °C
70 °F
Commonly defined value for room temperature
296 K
23 °C
73 °F
Mean on Earth during the Paleocene–Eocene Thermal Maximum about 55.8 million years ago[full citation needed]
297 K
24 °C
75 °F
Melting/freezing point of palm kernel oil
298 K
25 °C
77 °F
Melting/freezing point of coconut oil
300 K
27 °C
81 °F
Thermoneutral temperature of an unclothed human at rest
Estimated melting/freezing point of francium
302.9 K
29.8 °C
85.6 °F
Melting/freezing point of gallium
303.15 K
30 °C
86 °F
The rate of plant growth is typically no greater above this temperature than at this temperature. (see Growing degree-day)
304 K
31 °C
88 °F
Melting/freezing point of butter, critical point for carbon dioxide
307 K
34 °C
93 °F
Autoignition temperature of white phosphorus
307.6 K
34.4 °C
93.9 °F
Hottest annual mean temperature on Earth, at Dallol, Ethiopia
308 K
35 °C
95 °F
Hypothermic body temperature for humans (see Hypothermia)
Warmest sea measured, at the Red Sea
Melting/freezing point of palm oil
309.5 K
36.4 °C
97.5 °F
Average body temperature for a human[full citation needed]
311.03 K
37.87 °C
100.2 °F
Beginnings of a fever for humans
311.8 K
38.6 °C
101.5 °F
Average body temperature for a cat[full citation needed]
313.15 K
40 °C
104 °F
Maximum standard temperature recommended for hot tub users[full citation needed]
315 K
42 °C
108 °F
Usually fatal human fever
317.6 K
44.44 °C
112 °F
Hot threshold of pain if skin reaches this temperature
319.7 K
46.5 °C
115.7 °F
Highest human fever survived (Willie Jones)[full citation needed]
321.45 K
48.3 °C
119 °F
World's hottest air temperature recorded while raining, at Imperial, California, USA on July 24, 2018
322.1 K
48.9 °C
120.0 °F
Hottest air temperature recorded in South America, at Rivadavia, Argentina on 1905-12-11
Maximum safe temperature for hot water according to numeric U.S. plumbing codes
Water will cause a second-degree burn after 8 minutes and a third-degree burn after 10 minutes
323.9 K
50.7 °C
123.3 °F
Hottest air temperature recorded in the Southern Hemisphere, at Oodnadatta, Australia on 1960-02-01
329.87 K
56.7 °C
134.1 °F
Hottest measured air temperature on Earth, in Death Valley at Furnace Creek, Inyo County, California, United States of America on 10 July 1913.
333.15 K
60 °C
140 °F
Water will cause a second-degree burn in 3 seconds and a third-degree burn in 5 seconds
Average temperature of a hair dryer
336 K
63 °C
145.4 °F
Milk pasteurization
342 K
69 °C
157 °F
Boiling point of water on the summit of Mount Everest[full citation needed]
343.15 K
70 °C
158 °F
Food is well done
Hot springs at which some bacteria thrive
350 K
77 °C
170 °F
Poaching of food
351.52 K
78.37 °C
173.07 °F
Boiling point of ethanol
353.15 K
80 °C
176 °F
Average temperature of a sauna
355 K
82 °C
180 °F
Recommended final rinse temperature in industrial-grade commercial dishwashers[full citation needed]
355.6 K
82.4 °C
180.3 °F
Boiling point of isopropyl alcohol
366 K
93 °C
200 °F
Simmering of food
367 K
94 °C
201 °F
Hottest ground temperature recorded on Earth at Furnace Creek, Death Valley, California, USA on 1972-07-15[full citation needed]
371 K
98 °C
209 °F
Freezing/melting point of sodium
373.13 K
99.98 °C
211.97 °F
Boiling point of water at 1 atm pressure (see Celsius)
380 K
107 °C
225 °F
Smoke point of raw safflower oil
Syrup[vague] is concentrated to 75% sugar
388 K
115 °C
239 °F
Melting/freezing point of sulfur
400 K
127 °C
260 °F
Concorde nose tip during supersonic flight
Coldest known stars in space (approximate temperature)[full citation needed]
Kindling point of jet fuel (Jet A/Jet A-1)[full citation needed]
525 K
252 °C
485 °F
Smoke point of milkfat
Kindling point of jet fuel (Jet B)
538 K
265 °C
510 °F
Smoke point of refined safflower oil
574.5875 K
301.4375 °C
574.5875 °F
Point of coincidence of the Fahrenheit and Kelvin temperature scales
600.65 K
327.5 °C
621.5 °F
Melting/freezing point of lead
647 K
374 °C
705 °F
Critical point of superheated water
693 K
419 °C
787 °F
Melting/freezing point of zinc
723.15 K
450 °C
842 °F
Kindling point of aviation gasoline
738 K
465 °C
870 °F
Mean on Venus
749 K
476 °C
889 °F
Kindling point of magnesium
773.15 K
500 °C
932 °F
Oven on self-cleaning mode
798 K
525 °C
977 °F
Draper point (the point at which nearly all objects start to glow dim red)
858 K
585 °C
1085 °F
Kindling point of hydrogen
933.47 K
660.32 °C
1220.58 °F
Melting/freezing point of aluminium
1000 K
726.85 °C
1340.33 °F
SI multiples
SI multiples of kelvin (K)
Submultiples
Multiples
Value
SI symbol
Name
Value
SI symbol
Name
10−1 K
dK
decikelvin
101 K
daK
decakelvin
10−2 K
cK
centikelvin
102 K
hK
hectokelvin
10−3 K
mK
millikelvin
103 K
kK
kilokelvin
10−6 K
μK
microkelvin
106 K
MK
megakelvin
10−9 K
nK
nanokelvin
109 K
GK
gigakelvin
10−12 K
pK
picokelvin
1012 K
TK
terakelvin
10−15 K
fK
femtokelvin
1015 K
PK
petakelvin
10−18 K
aK
attokelvin
1018 K
EK
exakelvin
10−21 K
zK
zeptokelvin
1021 K
ZK
zettakelvin
10−24 K
yK
yoctokelvin
1024 K
YK
yottakelvin
10−27 K
rK
rontokelvin
1027 K
RK
ronnakelvin
10−30 K
qK
quectokelvin
1030 K
QK
quettakelvin
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