Temperaturskala

Ein temperaturskala er ein måte å dele eit termometer inn i grader på. Grunneininga for temperaturmåling er kelvin og er definert ut frå termodynamisk temperatur, og andre temperaturskalaer er fastlagt i tilhøve til kelvinskalaen.

Formalar for temperaturomrekning

Samanlikning	absolutt null	vatn frys	kroppstemp.	vatn kokar
Kelvin	0 K	273,15 K	310,15 K	373,15 K
Celsius	−273,15 °C	0 °C	37 °C	100 °C
Fahrenheit	−459,67 °F	32 °F	98,6 °F	212 °F
Rankine	0 °Ra	491,67 °Ra	558,27 °Ra	671,67 °Ra
Delisle	559,73 °De	150 °De	94,5 °De	0 °De
Newton	−90,14 °N	0 °N	12,21 °N	33 °N
Réaumur	−218,52 °Ré	0 °Ré	29,6 °Ré	80 °Ré
Rømer	−135,9 °Rø	7,5 °Rø	26,93 °Rø	60 °Rø

Kelvin

Celsius	[°C] = [K] − 273,15	[K] = [°C] + 273,15
Fahrenheit	[°F] = [K] · 9/5 − 459,67	[K] = ([°F] + 459,67) · 5/9
Rankine	[°Ra] = [K] · 9/5	[K] = [°Ra] · 5/9
Réaumur	[°Ré] = ([K] − 273,15) · 4/5	[K] = [°Ré] · 5/4 + 273,15
Newton	[°N] = ([K] − 273,15) · 33/100	[K] = [°N] · 100/33 + 273,15
Rømer	[°Rø] = ([K] − 273,15) · 21/40 + 7,5	[K] = ([°Rø] − 7,5) · 40/21 + 273,15
Delisle	[°De] = (373,15 − [K]) · 3/2	[K] = 373,15 − [°De] · 2/3

Matematisk oppstilte formlar:

$K={}^{\circ }C-273,15=\frac{5({}^{\circ }F+459,67)}{9}=\frac{5^{\circ }Ra}{9}=\frac{5^{\circ }R\acute{e}}{4}+273,15$

$K=\frac{100^{\circ }N}{33}+273,15=\frac{40({}^{\circ }R\ddot{o}-7,5)}{21}+273,15=373,15-\frac{2^{\circ }De}{3}$

Celsius

Kelvin	[K] = [°C] + 273,15	[°C] = [K] − 273,15
Fahrenheit	[°F] = [°C] · 9/5 + 32	[°C] = ([°F] − 32) · 5/9
Rankine	[°Ra] = [°C] · 9/5 + 491,67	[°C] = ([°Ra] − 491,67) · 5/9
Réaumur	[°Ré] = [°C] · 4/5	[°C] = [°Ré] · 5/4
Newton	[°N] = [°C] · 33/100	[°C] = [°N] · 100/33
Rømer	[°Rø] = [°C] · 21/40 + 7,5	[°C] = ([°Rø] − 7,5) · 40/21
Delisle	[°De] = (100 − [°C]) · 3/2	[°C] = 100 − [°De] · 2/3

Matematisk oppstilte formlar:

${}^{\circ }C=K-273,15=\frac{5({}^{\circ }F-32)}{9}=\frac{5(Ra-491,67)}{9}$

${}^{\circ }C=\frac{5^{\circ }R\acute{e}}{4}=\frac{100^{\circ }N}{33}=\frac{40({}^{\circ }R\ddot{o}-7,5)}{21}=\frac{2^{\circ }De}{3}-100$

Fahrenheit

Kelvin	[K] = ([°F] + 459,67) · 5/9	[°F] = [K] · 9/5 − 459,67
Celsius	[°C] = ([°F] − 32) · 5/9	[°F] = [°C] · 9/5 + 32
Rankine	[°Ra] = [°F] + 459,67	[°F] = [°Ra] − 459,67
Réaumur	[°Ré] = ([°F] − 32) · 4/9	[°F] = [°Ré] · 9/4 + 32
Newton	[°N] = ([°F] − 32) · 11/60	[°F] = [°N] · 60/11 + 32
Rømer	[°Rø] = ([°F] − 32) · 7/24 + 7,5	[°F] = ([°Rø] − 7,5) · 24/7 + 32
Delisle	[°De] = (212 − [°F]) · 5/6	[°F] = 212 − [°De] · 6/5

Matematisk oppstilte formlar:

${}^{\circ }F=\frac{9K}{5}-459,67=\frac{9{}^{\circ }C}{5}+32={}^{\circ }Ra-459,67=\frac{45^{\circ }R\acute{e}/4-273,15}{5}$

${}^{\circ }F=\frac{60^{\circ }N}{11}+32=\frac{24({}^{\circ }R\ddot{o}-7,5)}{7}+32=212-\frac{6De}{5}$

Rankine

Kelvin	[K] = [°R] · 5/9	[°R] = [K] · 9/5
Celsius	[°C] = [°R] · 5/9 − 273,15	[°R] = ([°C] + 273,15) · 9/5
Fahrenheit	[°F] = [°R] − 459,67	[°R] = [°F] + 459,67
Réaumur	[°Ré] = ([°R] · 5/9 + 273,15) · 4/5	[°R] = ([°Ré] · 5/4 − 273,15) · 9/5
Newton	[°N] = ([°R] − 491,67) · 11/60	[°R] = [°N] · 60/11 + 491,67
Rømer	[°Rø] = ([°R] − 491,67) · 7/24 + 7,5	[°R] = ([°Rø] − 7,5) · 24/7 + 491,67
Delisle	[°De] = (671,67 − [°R]) · 5/6	[°R] = 671,67 − [°De] · 6/5

Matematisk oppstilte formlar:

${}^{\circ }R=\frac{9K}{5}=\frac{9({}^{\circ }C+273,15)}{5}={}^{\circ }F+459,67=\frac{9(5^{\circ }R\acute{e}/5-273,15)}{5}$

${}^{\circ }R=\frac{60^{\circ }N}{11}+491,67=\frac{24({}^{\circ }R\ddot{o}-7,5)}{7}+491,67=671,67-\frac{6^{\circ }De}{5}$

Delisle

Kelvin	[K] = 373,15 − [°De] · 2/3	[°De] = (373,15 − [K]) · 3/2
Celsius	[°C] = 100 − [°De] · 2/3	[°De] = (100 − [°C]) · 3/2
Fahrenheit	[°F] = 212 − [°De] · 6/5	[°De] = (212 − [°F]) · 5/6
Rankine	[°Ra] = 671,67 − [°De] · 6/5	[°De] = (671,67 − [°Ra]) · 5/6
Réaumur	[°Ré] = 80 − [°De] · 8/15	[°De] = (80 − [°Ré]) · 15/8
Newton	[°N] = 33 − [°De] · 11/50	[°De] = (33 − [°N]) · 50/11
Rømer	[°Rø] = 60 − [°De] · 7/20	[°De] = (60 − [°Rø]) · 20/7

Matematisk oppstilte formlar:

${}^{\circ }De=\frac{3(373,15-K)}{2}=\frac{3(100-{}^{\circ }C)}{2}=\frac{5(212-{}^{\circ }F)}{6}$

${}^{\circ }De=\frac{5(671,67-{}^{\circ }Ra)}{6}=\frac{15(80{-}^{\circ }R\acute{e})}{8}=\frac{50(33-{}^{\circ }N)}{11}=\frac{20(60-{}^{\circ }R\ddot{o})}{7}$

Newton

Kelvin	[K] = [°N] · 100/33 + 273,15	[°N] = ([K] − 273,15) · 33/100
Celsius	[°C] = [°N] · 100/33	[°N] = [°C] · 33/100
Fahrenheit	[°F] = [°N] · 60/11 + 32	[°N] = ([°F] − 32) · 11/60
Rankine	[°Ra] = [°N] · 60/11 + 491,67	[°N] = ([°Ra] − 491,67) · 11/60
Réaumur	[°Ré] = [°N] · 80/33	[°N] = [°Ré] · 33/80
Rømer	[°Rø] = [°N] · 35/22 + 7,5	[°N] = ([°Rø] − 7,5) · 22/35
Delisle	[°De] = (33 − [°N]) · 50/11	[°N] = 33 − [°De] · 11/50

Matematisk oppstilte formlar:

${}^{\circ }N=\frac{33(K-273,15)}{100}=\frac{33^{\circ }C}{100}=\frac{11({}^{\circ }F-32)}{60}$

${}^{\circ }N=\frac{11({}^{\circ }Ra-491,67)}{60}=\frac{33^{\circ }R\acute{e}}{80}=\frac{22(R\ddot{o}-7,5)}{35}=33-\frac{11{}^{\circ }De}{50}$

Réaumur

Kelvin	[K] = [°Ré] · 5/4 + 273,15	[°Ré] = ([K] − 273,15) · 4/5
Celsius	[°C] = [°Ré] · 5/4	[°Ré] = [°C] · 4/5
Fahrenheit	[°F] = [°Ré] · 9/4 + 32	[°Ré] = ([°F] − 32) · 4/9
Rankine	[°Ra] = [°Ré] · 9/4 + 491,67	[°Ré] = ([°Ra] − 491,67) · 4/9
Newton	[°N] = [°Ré] · 33/80	[°Ré] = [°N] · 80/33
Rømer	[°Rø] = [°Ré] · 21/32 + 7,5	[°Ré] = ([°Rø] − 7,5) · 32/21
Delisle	[°De] = (80 − [°Ré]) · 15/8	[°Ré] = 80 − [°De] · 8/15

Matematisk oppstilte formlar:

${}^{\circ }R\acute{e}=\frac{4(K-273,15)}{5}=\frac{4{}^{\circ }C}{5}=\frac{4({}^{\circ }F-32)}{9}$

${}^{\circ }R\acute{e}=\frac{4({}^{\circ }Ra-491,67)}{9}=\frac{80^{\circ }N}{33}=\frac{32({}^{\circ }R\ddot{o}-7,5)}{21}=80-\frac{8^{\circ }De}{15}$

Rømer

Kelvin	[K] = ([°Rø] − 7,5) · 40/21 + 273,15	[°Rø] = ([K] − 273,15) · 21/40 + 7,5
Celsius	[°C] = ([°Rø] − 7,5) · 40/21	[°Rø] = [°C] · 21/40 + 7,5
Fahrenheit	[°F] = ([°Rø] − 7,5) · 24/7 + 32	[°Rø] = ([°F] − 32) · 7/24 + 7,5
Rankine	[°Ra] = ([°Rø] − 7,5) · 24/7 + 491,67	[°Rø] = ([°Ra] − 491,67) · 7/24 + 7,5
Réaumur	[°Ré] = ([°Rø] − 7,5) · 32/21	[°Rø] = [°Ré] · 21/32 + 7,5
Newton	[°N] = ([°Rø] − 7,5) · 22/35	[°Rø] = [°N] · 35/22 + 7,5
Delisle	[°De] = (60 − [°Rø]) · 20/7	[°Rø] = 60 − [°De] · 7/20

Matematisk oppstilte formlar:

${}^{\circ }R\ddot{o}=\frac{21(K-273,15)}{40}+7,5=\frac{21^{\circ }C}{40}+7,5=\frac{7({}^{\circ }F-32)}{24}+7,5$

${}^{\circ }R\ddot{o}=\frac{7({}^{\circ }Ra-491,67)}{24}+7,5=\frac{21^{\circ }R\acute{e}}{32}+7,5=\frac{35^{\circ }N}{22}+7,5=60-\frac{7^{\circ }De}{20}$

Bakgrunnsstoff

• Temperaturomrekning på nettet Mal:Webarchive

Kjelder

• Holtebekk, Trygve. (2009, 15. februar). Temperaturskala. I Store norske leksikon. Henta 16. november 2013 frå http://snl.no/temperaturskala.