SciPy

Constants (scipy.constants)

Physical and mathematical constants and units.

Mathematical constants

pi

Pi

golden

Golden ratio

golden_ratio

Golden ratio

Physical constants

c

speed of light in vacuum

speed_of_light

speed of light in vacuum

mu_0

the magnetic constant \(\mu_0\)

epsilon_0

the electric constant (vacuum permittivity), \(\epsilon_0\)

h

the Planck constant \(h\)

Planck

the Planck constant \(h\)

hbar

\(\hbar = h/(2\pi)\)

G

Newtonian constant of gravitation

gravitational_constant

Newtonian constant of gravitation

g

standard acceleration of gravity

e

elementary charge

elementary_charge

elementary charge

R

molar gas constant

gas_constant

molar gas constant

alpha

fine-structure constant

fine_structure

fine-structure constant

N_A

Avogadro constant

Avogadro

Avogadro constant

k

Boltzmann constant

Boltzmann

Boltzmann constant

sigma

Stefan-Boltzmann constant \(\sigma\)

Stefan_Boltzmann

Stefan-Boltzmann constant \(\sigma\)

Wien

Wien displacement law constant

Rydberg

Rydberg constant

m_e

electron mass

electron_mass

electron mass

m_p

proton mass

proton_mass

proton mass

m_n

neutron mass

neutron_mass

neutron mass

Constants database

In addition to the above variables, scipy.constants also contains the 2014 CODATA recommended values [CODATA2014] database containing more physical constants.

value(key)

Value in physical_constants indexed by key

unit(key)

Unit in physical_constants indexed by key

precision(key)

Relative precision in physical_constants indexed by key

find([sub, disp])

Return list of physical_constant keys containing a given string.

ConstantWarning

Accessing a constant no longer in current CODATA data set

scipy.constants.physical_constants

Dictionary of physical constants, of the format physical_constants[name] = (value, unit, uncertainty).

Available constants:

alpha particle mass

6.64465723e-27 kg

alpha particle mass energy equivalent

5.971920097e-10 J

alpha particle mass energy equivalent in MeV

3727.379378 MeV

alpha particle mass in u

4.001506179127 u

alpha particle molar mass

0.004001506179127 kg mol^-1

alpha particle-electron mass ratio

7294.29954136

alpha particle-proton mass ratio

3.97259968907

Angstrom star

1.00001495e-10 m

atomic mass constant

1.66053904e-27 kg

atomic mass constant energy equivalent

1.492418062e-10 J

atomic mass constant energy equivalent in MeV

931.4940954 MeV

atomic mass unit-electron volt relationship

931494095.4 eV

atomic mass unit-hartree relationship

34231776.902 E_h

atomic mass unit-hertz relationship

2.2523427206e+23 Hz

atomic mass unit-inverse meter relationship

751300661660000.0 m^-1

atomic mass unit-joule relationship

1.492418062e-10 J

atomic mass unit-kelvin relationship

10809543800000.0 K

atomic mass unit-kilogram relationship

1.66053904e-27 kg

atomic unit of 1st hyperpolarizability

3.206361329e-53 C^3 m^3 J^-2

atomic unit of 2nd hyperpolarizability

6.235380085e-65 C^4 m^4 J^-3

atomic unit of action

1.0545718e-34 J s

atomic unit of charge

1.6021766208e-19 C

atomic unit of charge density

1081202377000.0 C m^-3

atomic unit of current

0.006623618183 A

atomic unit of electric dipole mom.

8.478353552e-30 C m

atomic unit of electric field

514220670700.0 V m^-1

atomic unit of electric field gradient

9.717362356e+21 V m^-2

atomic unit of electric polarizability

1.6487772731e-41 C^2 m^2 J^-1

atomic unit of electric potential

27.21138602 V

atomic unit of electric quadrupole mom.

4.486551484e-40 C m^2

atomic unit of energy

4.35974465e-18 J

atomic unit of force

8.23872336e-08 N

atomic unit of length

5.2917721067e-11 m

atomic unit of mag. dipole mom.

1.854801999e-23 J T^-1

atomic unit of mag. flux density

235051.755 T

atomic unit of magnetizability

7.8910365886e-29 J T^-2

atomic unit of mass

9.10938356e-31 kg

atomic unit of mom.um

1.992851882e-24 kg m s^-1

atomic unit of permittivity

1.1126500560536183e-10 F m^-1

atomic unit of time

2.418884326509e-17 s

atomic unit of velocity

2187691.26277 m s^-1

Avogadro constant

6.022140857e+23 mol^-1

Bohr magneton

9.274009994e-24 J T^-1

Bohr magneton in eV/T

5.7883818012e-05 eV T^-1

Bohr magneton in Hz/T

13996245042.0 Hz T^-1

Bohr magneton in inverse meters per tesla

46.68644814 m^-1 T^-1

Bohr magneton in K/T

0.67171405 K T^-1

Bohr radius

5.2917721067e-11 m

Boltzmann constant

1.38064852e-23 J K^-1

Boltzmann constant in eV/K

8.6173303e-05 eV K^-1

Boltzmann constant in Hz/K

20836612000.0 Hz K^-1

Boltzmann constant in inverse meters per kelvin

69.503457 m^-1 K^-1

characteristic impedance of vacuum

376.73031346177066 ohm

classical electron radius

2.8179403227e-15 m

Compton wavelength

2.4263102367e-12 m

Compton wavelength over 2 pi

3.8615926764e-13 m

conductance quantum

7.748091731e-05 S

conventional value of Josephson constant

483597900000000.0 Hz V^-1

conventional value of von Klitzing constant

25812.807 ohm

Cu x unit

1.00207697e-13 m

deuteron g factor

0.8574382311

deuteron mag. mom.

4.33073504e-27 J T^-1

deuteron mag. mom. to Bohr magneton ratio

0.0004669754554

deuteron mag. mom. to nuclear magneton ratio

0.8574382311

deuteron mass

3.343583719e-27 kg

deuteron mass energy equivalent

3.005063183e-10 J

deuteron mass energy equivalent in MeV

1875.612928 MeV

deuteron mass in u

2.013553212745 u

deuteron molar mass

0.002013553212745 kg mol^-1

deuteron rms charge radius

2.1413e-15 m

deuteron-electron mag. mom. ratio

-0.0004664345535

deuteron-electron mass ratio

3670.48296785

deuteron-neutron mag. mom. ratio

-0.44820652

deuteron-proton mag. mom. ratio

0.3070122077

deuteron-proton mass ratio

1.99900750087

electric constant

8.854187817620389e-12 F m^-1

electron charge to mass quotient

-175882002400.0 C kg^-1

electron g factor

-2.00231930436182

electron gyromag. ratio

176085964400.0 s^-1 T^-1

electron gyromag. ratio over 2 pi

28024.95164 MHz T^-1

electron mag. mom.

-9.28476462e-24 J T^-1

electron mag. mom. anomaly

0.00115965218091

electron mag. mom. to Bohr magneton ratio

-1.00115965218091

electron mag. mom. to nuclear magneton ratio

-1838.28197234

electron mass

9.10938356e-31 kg

electron mass energy equivalent

8.18710565e-14 J

electron mass energy equivalent in MeV

0.5109989461 MeV

electron mass in u

0.00054857990907 u

electron molar mass

5.4857990907e-07 kg mol^-1

electron to alpha particle mass ratio

0.0001370933554798

electron to shielded helion mag. mom. ratio

864.058257

electron to shielded proton mag. mom. ratio

-658.2275971

electron volt

1.6021766208e-19 J

electron volt-atomic mass unit relationship

1.0735441105e-09 u

electron volt-hartree relationship

0.03674932248 E_h

electron volt-hertz relationship

241798926200000.0 Hz

electron volt-inverse meter relationship

806554.4005 m^-1

electron volt-joule relationship

1.6021766208e-19 J

electron volt-kelvin relationship

11604.5221 K

electron volt-kilogram relationship

1.782661907e-36 kg

electron-deuteron mag. mom. ratio

-2143.923499

electron-deuteron mass ratio

0.0002724437107484

electron-helion mass ratio

0.0001819543074854

electron-muon mag. mom. ratio

206.766988

electron-muon mass ratio

0.0048363317

electron-neutron mag. mom. ratio

960.9205

electron-neutron mass ratio

0.00054386734428

electron-proton mag. mom. ratio

-658.2106866

electron-proton mass ratio

0.000544617021352

electron-tau mass ratio

0.000287592

electron-triton mass ratio

0.0001819200062203

elementary charge

1.6021766208e-19 C

elementary charge over h

241798926200000.0 A J^-1

Faraday constant

96485.33289 C mol^-1

Faraday constant for conventional electric current

96485.3251 C_90 mol^-1

Fermi coupling constant

1.1663787e-05 GeV^-2

fine-structure constant

0.0072973525664

first radiation constant

3.74177179e-16 W m^2

first radiation constant for spectral radiance

1.191042953e-16 W m^2 sr^-1

Hartree energy

4.35974465e-18 J

Hartree energy in eV

27.21138602 eV

hartree-atomic mass unit relationship

2.9212623197e-08 u

hartree-electron volt relationship

27.21138602 eV

hartree-hertz relationship

6579683920711000.0 Hz

hartree-inverse meter relationship

21947463.13702 m^-1

hartree-joule relationship

4.35974465e-18 J

hartree-kelvin relationship

315775.13 K

hartree-kilogram relationship

4.850870129e-35 kg

helion g factor

-4.255250616

helion mag. mom.

-1.074617522e-26 J T^-1

helion mag. mom. to Bohr magneton ratio

-0.001158740958

helion mag. mom. to nuclear magneton ratio

-2.127625308

helion mass

5.0064127e-27 kg

helion mass energy equivalent

4.499539341e-10 J

helion mass energy equivalent in MeV

2808.391586 MeV

helion mass in u

3.01493224673 u

helion molar mass

0.00301493224673 kg mol^-1

helion-electron mass ratio

5495.88527922

helion-proton mass ratio

2.99315267046

hertz-atomic mass unit relationship

4.4398216616e-24 u

hertz-electron volt relationship

4.135667662e-15 eV

hertz-hartree relationship

1.5198298460088e-16 E_h

hertz-inverse meter relationship

3.3356409519815204e-09 m^-1

hertz-joule relationship

6.62607004e-34 J

hertz-kelvin relationship

4.7992447e-11 K

hertz-kilogram relationship

7.372497201e-51 kg

inverse fine-structure constant

137.035999139

inverse meter-atomic mass unit relationship

1.331025049e-15 u

inverse meter-electron volt relationship

1.2398419739e-06 eV

inverse meter-hartree relationship

4.556335252767e-08 E_h

inverse meter-hertz relationship

299792458.0 Hz

inverse meter-joule relationship

1.986445824e-25 J

inverse meter-kelvin relationship

0.0143877736 K

inverse meter-kilogram relationship

2.210219057e-42 kg

inverse of conductance quantum

12906.4037278 ohm

Josephson constant

483597852500000.0 Hz V^-1

joule-atomic mass unit relationship

6700535363.0 u

joule-electron volt relationship

6.241509126e+18 eV

joule-hartree relationship

2.293712317e+17 E_h

joule-hertz relationship

1.509190205e+33 Hz

joule-inverse meter relationship

5.034116651e+24 m^-1

joule-kelvin relationship

7.2429731e+22 K

joule-kilogram relationship

1.1126500560536185e-17 kg

kelvin-atomic mass unit relationship

9.2510842e-14 u

kelvin-electron volt relationship

8.6173303e-05 eV

kelvin-hartree relationship

3.1668105e-06 E_h

kelvin-hertz relationship

20836612000.0 Hz

kelvin-inverse meter relationship

69.503457 m^-1

kelvin-joule relationship

1.38064852e-23 J

kelvin-kilogram relationship

1.53617865e-40 kg

kilogram-atomic mass unit relationship

6.022140857e+26 u

kilogram-electron volt relationship

5.60958865e+35 eV

kilogram-hartree relationship

2.061485823e+34 E_h

kilogram-hertz relationship

1.356392512e+50 Hz

kilogram-inverse meter relationship

4.524438411e+41 m^-1

kilogram-joule relationship

8.987551787368176e+16 J

kilogram-kelvin relationship

6.5096595e+39 K

lattice parameter of silicon

5.431020504e-10 m

Loschmidt constant (273.15 K, 100 kPa)

2.6516467e+25 m^-3

Loschmidt constant (273.15 K, 101.325 kPa)

2.6867811e+25 m^-3

mag. constant

1.2566370614359173e-06 N A^-2

mag. flux quantum

2.067833831e-15 Wb

Mo x unit

1.00209952e-13 m

molar gas constant

8.3144598 J mol^-1 K^-1

molar mass constant

0.001 kg mol^-1

molar mass of carbon-12

0.012 kg mol^-1

molar Planck constant

3.990312711e-10 J s mol^-1

molar Planck constant times c

0.119626565582 J m mol^-1

molar volume of ideal gas (273.15 K, 100 kPa)

0.022710947 m^3 mol^-1

molar volume of ideal gas (273.15 K, 101.325 kPa)

0.022413962 m^3 mol^-1

molar volume of silicon

1.205883214e-05 m^3 mol^-1

muon Compton wavelength

1.173444111e-14 m

muon Compton wavelength over 2 pi

1.867594308e-15 m

muon g factor

-2.0023318418

muon mag. mom.

-4.49044826e-26 J T^-1

muon mag. mom. anomaly

0.00116592089

muon mag. mom. to Bohr magneton ratio

-0.00484197048

muon mag. mom. to nuclear magneton ratio

-8.89059705

muon mass

1.883531594e-28 kg

muon mass energy equivalent

1.692833774e-11 J

muon mass energy equivalent in MeV

105.6583745 MeV

muon mass in u

0.1134289257 u

muon molar mass

0.0001134289257 kg mol^-1

muon-electron mass ratio

206.7682826

muon-neutron mass ratio

0.1124545167

muon-proton mag. mom. ratio

-3.183345142

muon-proton mass ratio

0.1126095262

muon-tau mass ratio

0.0594649

natural unit of action

1.0545718e-34 J s

natural unit of action in eV s

6.582119514e-16 eV s

natural unit of energy

8.18710565e-14 J

natural unit of energy in MeV

0.5109989461 MeV

natural unit of length

3.8615926764e-13 m

natural unit of mass

9.10938356e-31 kg

natural unit of mom.um

2.730924488e-22 kg m s^-1

natural unit of mom.um in MeV/c

0.5109989461 MeV/c

natural unit of time

1.28808866712e-21 s

natural unit of velocity

299792458.0 m s^-1

neutron Compton wavelength

1.31959090481e-15 m

neutron Compton wavelength over 2 pi

2.1001941536e-16 m

neutron g factor

-3.82608545

neutron gyromag. ratio

183247172.0 s^-1 T^-1

neutron gyromag. ratio over 2 pi

29.1646933 MHz T^-1

neutron mag. mom.

-9.662365e-27 J T^-1

neutron mag. mom. to Bohr magneton ratio

-0.00104187563

neutron mag. mom. to nuclear magneton ratio

-1.91304273

neutron mass

1.674927471e-27 kg

neutron mass energy equivalent

1.505349739e-10 J

neutron mass energy equivalent in MeV

939.5654133 MeV

neutron mass in u

1.00866491588 u

neutron molar mass

0.00100866491588 kg mol^-1

neutron to shielded proton mag. mom. ratio

-0.68499694

neutron-electron mag. mom. ratio

0.00104066882

neutron-electron mass ratio

1838.68366158

neutron-muon mass ratio

8.89248408

neutron-proton mag. mom. ratio

-0.68497934

neutron-proton mass difference

2.30557377e-30

neutron-proton mass difference energy equivalent

2.07214637e-13

neutron-proton mass difference energy equivalent in MeV

1.29333205

neutron-proton mass difference in u

0.001388449

neutron-proton mass ratio

1.00137841898

neutron-tau mass ratio

0.52879

Newtonian constant of gravitation

6.67408e-11 m^3 kg^-1 s^-2

Newtonian constant of gravitation over h-bar c

6.70861e-39 (GeV/c^2)^-2

nuclear magneton

5.050783699e-27 J T^-1

nuclear magneton in eV/T

3.152451255e-08 eV T^-1

nuclear magneton in inverse meters per tesla

0.02542623432 m^-1 T^-1

nuclear magneton in K/T

0.0003658269 K T^-1

nuclear magneton in MHz/T

7.622593285 MHz T^-1

Planck constant

6.62607004e-34 J s

Planck constant in eV s

4.135667662e-15 eV s

Planck constant over 2 pi

1.0545718e-34 J s

Planck constant over 2 pi in eV s

6.582119514e-16 eV s

Planck constant over 2 pi times c in MeV fm

197.3269788 MeV fm

Planck length

1.616229e-35 m

Planck mass

2.17647e-08 kg

Planck mass energy equivalent in GeV

1.22091e+19 GeV

Planck temperature

1.416808e+32 K

Planck time

5.39116e-44 s

proton charge to mass quotient

95788332.26 C kg^-1

proton Compton wavelength

1.32140985396e-15 m

proton Compton wavelength over 2 pi

2.10308910109e-16 m

proton g factor

5.585694702

proton gyromag. ratio

267522190.0 s^-1 T^-1

proton gyromag. ratio over 2 pi

42.57747892 MHz T^-1

proton mag. mom.

1.4106067873e-26 J T^-1

proton mag. mom. to Bohr magneton ratio

0.0015210322053

proton mag. mom. to nuclear magneton ratio

2.7928473508

proton mag. shielding correction

2.5691e-05

proton mass

1.672621898e-27 kg

proton mass energy equivalent

1.503277593e-10 J

proton mass energy equivalent in MeV

938.2720813 MeV

proton mass in u

1.007276466879 u

proton molar mass

0.001007276466879 kg mol^-1

proton rms charge radius

8.751e-16 m

proton-electron mass ratio

1836.15267389

proton-muon mass ratio

8.88024338

proton-neutron mag. mom. ratio

-1.45989805

proton-neutron mass ratio

0.99862347844

proton-tau mass ratio

0.528063

quantum of circulation

0.00036369475486 m^2 s^-1

quantum of circulation times 2

0.00072738950972 m^2 s^-1

Rydberg constant

10973731.568508 m^-1

Rydberg constant times c in Hz

3289841960355000.0 Hz

Rydberg constant times hc in eV

13.605693009 eV

Rydberg constant times hc in J

2.179872325e-18 J

Sackur-Tetrode constant (1 K, 100 kPa)

-1.1517084

Sackur-Tetrode constant (1 K, 101.325 kPa)

-1.1648714

second radiation constant

0.0143877736 m K

shielded helion gyromag. ratio

203789458.5 s^-1 T^-1

shielded helion gyromag. ratio over 2 pi

32.43409966 MHz T^-1

shielded helion mag. mom.

-1.07455308e-26 J T^-1

shielded helion mag. mom. to Bohr magneton ratio

-0.001158671471

shielded helion mag. mom. to nuclear magneton ratio

-2.12749772

shielded helion to proton mag. mom. ratio

-0.7617665603

shielded helion to shielded proton mag. mom. ratio

-0.7617861313

shielded proton gyromag. ratio

267515317.1 s^-1 T^-1

shielded proton gyromag. ratio over 2 pi

42.57638507 MHz T^-1

shielded proton mag. mom.

1.410570547e-26 J T^-1

shielded proton mag. mom. to Bohr magneton ratio

0.001520993128

shielded proton mag. mom. to nuclear magneton ratio

2.7927756

speed of light in vacuum

299792458.0 m s^-1

standard acceleration of gravity

9.80665 m s^-2

standard atmosphere

101325.0 Pa

standard-state pressure

100000.0 Pa

Stefan-Boltzmann constant

5.670367e-08 W m^-2 K^-4

tau Compton wavelength

6.97787e-16 m

tau Compton wavelength over 2 pi

1.11056e-16 m

tau mass

3.16747e-27 kg

tau mass energy equivalent

2.84678e-10 J

tau mass energy equivalent in MeV

1776.82 MeV

tau mass in u

1.90749 u

tau molar mass

0.00190749 kg mol^-1

tau-electron mass ratio

3477.15

tau-muon mass ratio

16.8167

tau-neutron mass ratio

1.89111

tau-proton mass ratio

1.89372

Thomson cross section

6.6524587158e-29 m^2

triton g factor

5.95792492

triton mag. mom.

1.504609503e-26 J T^-1

triton mag. mom. to Bohr magneton ratio

0.0016223936616

triton mag. mom. to nuclear magneton ratio

2.97896246

triton mass

5.007356665e-27 kg

triton mass energy equivalent

4.500387735e-10 J

triton mass energy equivalent in MeV

2808.921112 MeV

triton mass in u

3.01550071632 u

triton molar mass

0.00301550071632 kg mol^-1

triton-electron mass ratio

5496.92153588

triton-proton mass ratio

2.99371703348

unified atomic mass unit

1.66053904e-27 kg

von Klitzing constant

25812.8074555 ohm

weak mixing angle

0.2223

Wien frequency displacement law constant

58789238000.0 Hz K^-1

Wien wavelength displacement law constant

0.0028977729 m K

{220} lattice spacing of silicon

1.920155714e-10 m

Units

SI prefixes

yotta

\(10^{24}\)

zetta

\(10^{21}\)

exa

\(10^{18}\)

peta

\(10^{15}\)

tera

\(10^{12}\)

giga

\(10^{9}\)

mega

\(10^{6}\)

kilo

\(10^{3}\)

hecto

\(10^{2}\)

deka

\(10^{1}\)

deci

\(10^{-1}\)

centi

\(10^{-2}\)

milli

\(10^{-3}\)

micro

\(10^{-6}\)

nano

\(10^{-9}\)

pico

\(10^{-12}\)

femto

\(10^{-15}\)

atto

\(10^{-18}\)

zepto

\(10^{-21}\)

Binary prefixes

kibi

\(2^{10}\)

mebi

\(2^{20}\)

gibi

\(2^{30}\)

tebi

\(2^{40}\)

pebi

\(2^{50}\)

exbi

\(2^{60}\)

zebi

\(2^{70}\)

yobi

\(2^{80}\)

Mass

gram

\(10^{-3}\) kg

metric_ton

\(10^{3}\) kg

grain

one grain in kg

lb

one pound (avoirdupous) in kg

pound

one pound (avoirdupous) in kg

blob

one inch version of a slug in kg (added in 1.0.0)

slinch

one inch version of a slug in kg (added in 1.0.0)

slug

one slug in kg (added in 1.0.0)

oz

one ounce in kg

ounce

one ounce in kg

stone

one stone in kg

grain

one grain in kg

long_ton

one long ton in kg

short_ton

one short ton in kg

troy_ounce

one Troy ounce in kg

troy_pound

one Troy pound in kg

carat

one carat in kg

m_u

atomic mass constant (in kg)

u

atomic mass constant (in kg)

atomic_mass

atomic mass constant (in kg)

Angle

degree

degree in radians

arcmin

arc minute in radians

arcminute

arc minute in radians

arcsec

arc second in radians

arcsecond

arc second in radians

Time

minute

one minute in seconds

hour

one hour in seconds

day

one day in seconds

week

one week in seconds

year

one year (365 days) in seconds

Julian_year

one Julian year (365.25 days) in seconds

Length

inch

one inch in meters

foot

one foot in meters

yard

one yard in meters

mile

one mile in meters

mil

one mil in meters

pt

one point in meters

point

one point in meters

survey_foot

one survey foot in meters

survey_mile

one survey mile in meters

nautical_mile

one nautical mile in meters

fermi

one Fermi in meters

angstrom

one Angstrom in meters

micron

one micron in meters

au

one astronomical unit in meters

astronomical_unit

one astronomical unit in meters

light_year

one light year in meters

parsec

one parsec in meters

Pressure

atm

standard atmosphere in pascals

atmosphere

standard atmosphere in pascals

bar

one bar in pascals

torr

one torr (mmHg) in pascals

mmHg

one torr (mmHg) in pascals

psi

one psi in pascals

Area

hectare

one hectare in square meters

acre

one acre in square meters

Volume

liter

one liter in cubic meters

litre

one liter in cubic meters

gallon

one gallon (US) in cubic meters

gallon_US

one gallon (US) in cubic meters

gallon_imp

one gallon (UK) in cubic meters

fluid_ounce

one fluid ounce (US) in cubic meters

fluid_ounce_US

one fluid ounce (US) in cubic meters

fluid_ounce_imp

one fluid ounce (UK) in cubic meters

bbl

one barrel in cubic meters

barrel

one barrel in cubic meters

Speed

kmh

kilometers per hour in meters per second

mph

miles per hour in meters per second

mach

one Mach (approx., at 15 C, 1 atm) in meters per second

speed_of_sound

one Mach (approx., at 15 C, 1 atm) in meters per second

knot

one knot in meters per second

Temperature

zero_Celsius

zero of Celsius scale in Kelvin

degree_Fahrenheit

one Fahrenheit (only differences) in Kelvins

convert_temperature(val, old_scale, new_scale)

Convert from a temperature scale to another one among Celsius, Kelvin, Fahrenheit and Rankine scales.

Energy

eV

one electron volt in Joules

electron_volt

one electron volt in Joules

calorie

one calorie (thermochemical) in Joules

calorie_th

one calorie (thermochemical) in Joules

calorie_IT

one calorie (International Steam Table calorie, 1956) in Joules

erg

one erg in Joules

Btu

one British thermal unit (International Steam Table) in Joules

Btu_IT

one British thermal unit (International Steam Table) in Joules

Btu_th

one British thermal unit (thermochemical) in Joules

ton_TNT

one ton of TNT in Joules

Power

hp

one horsepower in watts

horsepower

one horsepower in watts

Force

dyn

one dyne in newtons

dyne

one dyne in newtons

lbf

one pound force in newtons

pound_force

one pound force in newtons

kgf

one kilogram force in newtons

kilogram_force

one kilogram force in newtons

Optics

lambda2nu(lambda_)

Convert wavelength to optical frequency

nu2lambda(nu)

Convert optical frequency to wavelength.

References

CODATA2014

CODATA Recommended Values of the Fundamental Physical Constants 2014.

https://physics.nist.gov/cuu/Constants/