| Absolute zero |
-2.73567195834311e2 C° |
-2.7315e2 |
0.163848 |
0 |
3 |
-2 |
| Acceleration of free fall, standard |
9.79795897113276 m s-2 |
9.80665 |
0.088702 |
[ 2.5 0.5 0 ] |
AMU ( Atomic mass unit )(Atomic mass constant)
1.69645003283649e-27 kg NIST 1.66053373e-27 wd -2.117427 [ 1 3 1 ] |
Avogadro constant
5.89462752192205e23 mol-1 NIST 6.02214199e23 wd 2.163262 [ -1 -3 -1 ] |
Bohr magneton
9.26251354071094e-24 J T-1 NIST 9.2740089e-24 wd 0.124107 [ -0.5 -5 -1 ] |
Bohr radius
5.30516476972985e-11 m NIST 5.291772083e-11 wd -0.252446 [ -1 -1 -1 ] |
Boltzmann in eV/k
1.42122303375687 m-1 K-1 NIST 1.38965030 wd -2.221519 [ 4 2 2 ] |
Boltzmann in inverse-meters/k
6.94688515553321e1 m-1K-1 NIST 6.950396e1 wd -0.674909 [ -2.5 -4 1 ] |
Characteristic impedance of a vacuum
3.76991118430775e2 ohm NIST 3.767303135e2 wd -0.069181 [ 2 1 1 ] |
Classical electron radius
2.81447732339827e-15 m NIST 2.817940285e-15 wd 0.123041 [ -2 -2 -2 ] |
Compton wavelength
2.43085405362420e112 m NIST 2.436310215e-12 wd 0.224455 [ 1.5 3 -1 ] |
Compton wavelength/2π
3.8688243856926e-13 m NIST 3.861592642e-13 wd 0.224455 [ 0.5 3 -2 ] |
Conductance quantum
7.53982236861550e-12 ×10-12 m NIST 7.748091696 wd 2.762258 [ 3 1 1 ] |
Conversion constant hc
1.98943678864869 J m NIST 1.97327053e-12 wd -0.022608 [ -4 0 1 ] |
Conversion constant (hc)2
3.95785873602882e-25 GeV2 mbarn NIST 3.8937966e-25 wd -0.150362 [ -8 0 2 ] |
Deuteron mass
3.34985481582667×1014 Hz V-1 NIST 3.34358309 wd -0.1872238 [ 3.5 1 2 ] |
Dirac's constant = Planck/2π
1.05542699627425e-34 J s NIST 1.05457160e-34 wd -0.0812377 [ -5 -1 -2 ] |
Electron mass
9.11890652781949e-31 kg NIST 9.10938188e-31 wd -0.104449 [ 0 2 -2 ] |
Electron-proton mass ratio
5.444359250871030e-4 NIST 5.44662e-4 wd -0.041564 [ -2.5 1 -4 ] |
Electron volt
1.59154943091896e-15 J NIST 1.602176462e-15 wd 0.667716 [ -1 0 -1 ] |
Elementary charge
4.77464829275687e-19 C NIST 4.80298e-19 wd 0.5933790 [ -1 1 -1 ] |
Faraday constant
9.67019789831849e3 ×103 C mol-1 NIST 9.6485341e3 wd -0.224026 [ 2.5 0.5 2 ] |
Fermi coupling constant
1.16355283466289e-5 Ge V2 NIST 1.16639e-5 wd 0.243836 [ 0 -3 1 ] |
Fine-structure constant (maximum)
7.29512522224832e-5 NIST 7.29735253e-5 wd 0.030531 [ 3 2 -2 ] |
First radiation constant
3.75e-16 W m2 NIST 3.74177107e-16 wd -0.219438 [ -3 1 0 ] |
Hartree energy
4.36485667399102e-18 J NIST 4.334974351e-18 wd -0.684612 [ -1.5 -4 0 ] |
Helion mass
5.00175731198395e14 Hz V-1 NIST 5.006641174e14 wd 0.976429 [ 0.5 -2 -1 ] |
Hydrogen at infinity
1.21585420370805e3 m-1 NIST 1.21567370e3 wd -0.014846 [ 2 1 -2 ] |
Hydrogen Rydberg number aka Rydberg constant
1.09662271123215e7 m-1 NIST 1.09737316e7 wd 0.068432 [ 0 -2 2 ] |
Ionization conversion factor aka inverse meter-electron volt relationship
1.24092600029278e4 eV cm NIST 1.23984244e4 wd -0.087319 [ -0.5 0.5 -2 ] |
Josephson frequency-voltage quotient
4.8e14 V-1 NIST 4.83597898e14 wd 0.740562 [ 4 1 0 ] |
Lattice parameter for Silicon
5.46942162065441e-12 m NIST 5.43219288e-12 wd -0.690671 [ -1 5 -1 ] |
Lattice spacing for Silicon
1.93373255856653e-12 m NIST 1.920155845e-12 wd -0.702099 [ -2 5 -1 ] |
Loschmidt constant (T=273.15 K, p=100 kPa) suggested aka = number density formula
2.68616608286624e25 m-3 NIST 2.68677750e25 wd 0.022762 [ 0.5 -2 2 ] |
Magnetic flux quantum
2.083333333333333e-15 Wb NIST 2.067833636e-15 wd -0.743985 [ -4 -1 0 ] |
Molar gas constant
8.37758040957277 J mol-1 K NIST 8.134472 wd -2.901893 [ 3 -1 1 ] |
Molar Planck constant
3.90899628249760e-10 J s mol-1 NIST 3.990312689e-10 wd 2.080237 [ -5 -4 -2 ] |
Molar volume (Ideal gas, T=273.15 K, p=101.325 kPa)
2.23968989119016e1 m-2 mol-1 NIST 2.2413996e1 wd 0.076337 [ -4 -2 -3 ] |
Nccp sphere packing density
7.40480489693058e-1 [ -0.5 -1 1 ] |
Neutron mass
1.67551608181455e-27 kg NIST 1.67492716e-27 wd -0.035148 [4 -1 1 ] |
Newtonian constant of gravitation
6.666666666666667e-11 N m2/kg2 NIST 6.673e-11 wd 0.095000 [ 1 -1 0 ] |
Nuclear magneton
5.06605918211689e-27 J T-1 NIST 5.06605e-27 wd -0.000181 [ -1 0 -2 ] |
Permeability of vacuum
1.25663706143592e-8 ×10-8 N A-2 NIST 1.25663706143592e-8 wd 0.000000 [ 2 0 1 ] |
Permittivity of vacuum
8.84194128288308e-12 F m-1 NIST 8.854187817e-12 wd -0.138505 [ -2 -2 -1 ] |
Pi
3.1415926535897932 [ 0 0 1 ] |
Pi2
9.86960440108936 [ 0 0 2 ] |
Planck constant
6.63145596216231e-34 J s NIST 6.62606876e-34 wd -0.081237 [ -4 -1 -1 ] |
Proton mass
1.66666666666667e-27 kg NIST 1.67262158e-27 wd 0.357295 [ -1 -1 0 ] |
Proton mass/electron mass
1.82770451872025e3 NIST 1.836e3 wd 0.453874 [ -1 -3 2 ] |
Proton specific charge
9.54929658551373 C kg NIST 9.57883408 wd 0.309316 [ 0 1 -1 ] |
Quantum of circulation
3.62759872846843e-4 NIST 3.636947516e-4 wd 0.257713 [ 1 -1 1 ] |
Rydberg constant
1.09662271123215e7 m-1 NIST 1.097373157e7 wd 0.068432 [ 0 -2 2 ] |
Rydberg times hc in eV
1.36082763487954 eV NIST 1.3609569172 wd -0.018993 [ -0.5 -1.5 0 ] |
Rydberg times hc in J
2.18242833699551 J NIST 2.17887197 wd -0.117134 [ -3 -4 0 ] |
S1 - S2 for Hydrogen
2.46826829897686e3 S-1 T-1 NIST 2.466061413e3 wd -0.089410 [ -0.5 -2 1 ] |
Sakur-Tetrode
1.15429484714567e3 Nm NIST 1.15170480e3 wd -0.0224383 [ -1 1.5 1 ] |
Second radiation constant
1.432239668782706e-2 m K NIST 1.43877520e-2 wd 0.445458 [ -1 2 -1 ] |
Specific electron charge
1.75431780277577e-1 Hz V-1 NIST 1.75880470e-1 wd 0.255763 [ -2 2.5 -1 ] |
Speed of light in vacuum
3.0e8 m s-1 NIST 2.99792458e8 wd -0.069181 [ 0 1 0 ] |
Speed of sound in air at STP
3.30797337253076e2 ×102 m s-1 NIST 3.314e2 wd 0.182185 [ 1 1.5 -1 ] |
Standard atmospheric pressure
1.01321183642338e5 Pa NIST 101325e5 wd 0.03767 [0 0 -2 ] |
Stefan-Boltzmann constant
5.65685424949240e-8 W m-2 K4 NIST 5.6704e-b wd 0.239457 [ 2.5 0 0 ] |
Tau mass
4.8e14 kg NIST 4.83597898e14 wd 0.740562 [ 4 1 0 ] |
Thomson cross section
6.66432440723752e-27 kg mol-1 NIST 6.65245854e-27 wd 0.-0.178051 [ -1 1 1 ] |
Triton mass
3.19775182595295e-27 kg mol-1 NIST 3.167885e-27 wd -0.933994 [ 2 4 4 ] |
Von Klitzing constant
2.61799387799149e-4 ohm NIST 2.581280757e-4 wd -1.402338 [ -2 -1 1 ] |
W boson
8.16783548773025e1 GeV c-2 NIST 8.0412e1 wd -1.550417 [ 2 -2.5 -1 ] |
Wavenumber/photon energy
8.05849824859872e-4 eV-1 cm-1 NIST 8.06554477e-4 wd 0.087442 [ 0.5 -1 2 ] |
Wien frequency displacement
5.899255650988787e10 Hz k-1 NIST 5.878933e10 wd -0.231199 [ -3 -1 0 ] |
Wien wavelength displacement
2.88675134594812e-3 m k NIST 2.8977586e-3 wd 0.381649 [ -1 -0.5 0 ] |
Z boson
9.24080509775834e1 GeV c-2 NIST 9.11874e1 wd -1.321426 [ 5.5 -2.5 -1 ] |
Zeeman/Gauss
4.67818080740209e7 m guass-1 NIST 4.669e7 wd -0.196247 [ 1.5 1.5 -1 ] |
Energy Equivalence (1 m-1 ) = speed of light
3.0e8 x10 Hz NIST 2.99792458e8 wd -0.069181 [ 0 1 0 ] |
Energy Equivalence (1 m-1 ) hc/k = second radiation constant
1.43239448782706e-2 K NIST 1.4387752e-2 wd 0.445458 [ -1 2 -1 ] |
Energy Equivalence (1 m-1 ) hc = ionization conversion factor
1.24092600029278e-6 eV NIST 1.239841875e-6 wd -0.087319 [ -0.5 0.5 -2 ] |
Energy Equivalence (1 m-1 ) h/c= 4/3
1.33333333333333e-15 u-1 NIST 1.33310250394e-15 wd -0.017312 [ 2 -1 0 ] |
Energy Equivalence ( 1 Hz ) h/c = 1/3
3.33333333333333e-9 m-1 NIST 3.335640951e-9 wd 0.069228 [ 0 -1 0 ] |
Energy Equivalence ( 1 K ) k/hc = Boltzmann in inverse meters/kelvin
6.946885155553321e1 m-1 NIST 6.950356e1 wd -0.276460 [ -2.5 -4 1 ] |
Energy Equivalence ( 1 K ) k/hc = magnetic flux quantum
2.083333333333333e1 Hz NIST 2.083644e1 wd -0.743985 [ -4 -1 0 ] |
Energy Equivalence ( 1 K ) k/hc =
8.617546166869985e-5 eV-1 NIST 8.617343e-5 wd 0.095812 [ -4.5 -1.5 -2 ] |
Energy Equivalence ( 1 K ) k/hc = eV m-1 = 2π
6.28318530717956 eV NIST 6.2415045 wd [ 1 0 1 ] |
Energy Equivalence ( 1 K ) k/hc = eV
1.59154943091896e-19 C m-1 NIST 1.602176487e-19 wd 0. [ -1 0 -1 ] |
Energy Equivalence ( 1 K ) k/hc = wavenumber/photo energy
8.05849824859872e-4 m-1 NIST 8.06554477e-4 wd 0.087442 [ 0.5 -1 2 ] |
Energy Equivalence ( 1 K ) k/hc = 24
2.4e1 K NIST 2.417989454e1 wd 0. [ 3 1 0 ] |
Energy Equivalence ( 1 K ) k/hc = Fermi coupling
1.16355283466289e-5 kge V2 NIST 1.16639e-5 wd 0.243836 [ 0 -3 1 ] |
Energy Equivalence ( 1 K ) k/hc = Avogadro
5.89462752192205e23 u NIST 6.02214199e23 wd 2.163262 [ -1 -3 -1 ] |
Energy Equivalence ( 1 K ) k/hc = amu
1.69645003283649e-27 kg NIST 1.66053373e-27 wd -2.117427 [ 1 3 1 ] |
Energy Equivalence ( 1 K ) k/hc = 4/27 eV
1.0742958658703e1 u NIST 1.0733544177e1 wd 0.069033 [ 3 -1 5 ] |
Natural unit of action = Planck/2π
1.05542699627425e-34 J s NIST 1.05457160e-34 wd -0.0812377 [ -5 -1 -2 ] |
Natural unit of energy = electron mass times the speed of light2
8.20701587502836e-14 J NIST 8.18710414e-14 wd -0.242618 [ 0 4 -2 ] |
Natural unit of length = Compton wavelength/2π
3.8688243856926e-13 m NIST 3.8615926454e-13 wd 0.224455 [ 0.5 3 -2 ] |
Natural unit of mass = electron mass
9.11890652781949e-31 kg NIST 9.10938188e-31 wd -0.104449 [ 0 2 -2 ] |
Natural unit of momentum = electron mass times the speed of light
2.72567185834312e-22 kg m s-1 NIST 2.73092398e-22 wd -0.173558 [ 4 3 -2 ] |
Natural unit of time
1.28600823045267e-21 s NIST 1.28808866e-21 wd 0.161774 [ 4 1 0 ] |
Natural unit of velocity = light speed
3.0e8 m s-1 NIST 2.99792458 wd -0.069181 [ 0 1 0 ] |
Atomic unit of action = Planck/2π
1.05542699627425e-34 J s NIST 1.05457160e-34 wd -0.0812377 [ -5 -1 -2 ] |
Atomic unit of charge
1.59154943091896e-19 C NIST 1.602176462e-19 wd 0.667716 [ -1 0 -1 ] |
Atomic unit of charge density
1.06059172531765e12 C m-1 NIST 1.081202285e12 wd 1.433977 [ 2 3 2 ] |
Atomic unit of current
6.53197264742182e-3 C NIST 6.62361753e-3 wd 1.403020 [ 3.5 -0.5 0 ] |
Atomic unit of dipole moment
8.44343187019481e-30 C m NIST 8.47835267e-30 wd 0.413584 [ -2 -1 -2 ] |
Atomic unit of electric field
5.13019932064746e11 V m-1 NIST 5.14220624e11 wd 0.234044 [ 1.5 -0.5 1 ] |
Atomic unit of electric field gradient
9.69968149775782e21 V m-2 NIST 9.71736153e21 wd 0.182274 [ -0.5 -6 0 ] |
Atomic unit of electric polarizability
1.63330777526134e-41 C2m2J-1 NIST 1.648777251e-41 wd -2.221519 [ 4 2 2 ] |
Atomic unit of electric potential
2.72165526975909e1 V NIST 2.71138386e1 wd -0.377413 [ 0.5 -1.5 0 ] |
Atomic unit of energy = Hartree energy
4.36485667399102e-18 J NIST 4.33497435e-18 wd -0.684612 [ -1.5 -4 0 ] |
Atomic unit of first hyperpolarizabilty
3.2081194548886e-53 C3m3J-2 NIST 3.20636157e-53 wd -0.054795 [ -5 0 -4 ] |
Atomic unit of force
8.16496580927728e-8 N NIST 8.23872181e-8 wd 0.903323 [ 0.5 -0.5 0 ] |
Atomic unit of length = Bohr radius
5.30516476972985e-8 m NIST 5.29177208e-8 wd -0.252446 [ -1 -1 -1 ] |
Atomic unit of magnetic dipole moment
1.84207110060064e-23 J T-1 NIST 1.854801799e-23 wd 0.691108 [ -6 -3 -1 ] |
Atomic unit of magnetic flux density
2.35619449019234e5 T NIST 2.350517349e5 wd -0.240945 [ -2 1 1 ] |
Atomic unit of magnetizability
1.42122303375687e-23 J T-2 NIST 1.38965030e-23 wd -2.221519 [ 4 2 2 ] |
Atomic unit of mass = electron mass
9.11890652781949e-31 kg NIST 9.10938188e-31 wd -0.104449 [ 0 2 -2 ] |
Atomic unit of momentum
1.98943678864869e-24 V m-1 NIST 1.99285151e-24 wd 0.171640 [ -4 0 -1 ] |
Atomic unit of permittivity
1.10227038425243e-11 F m-1 NIST 1.112650056e-11 wd 0.941663 [ -0.5 2.5 0 ] |
Atomic unit of quadrupole moment
4.47937978238033 e-40 C m2 NIST 4.486551e-40 wd 0.160094 [ -3 -2 -3 ] |
Atomic unit of second hyperpolarizabilty
6.22136080886156e-45 C4 m4 J-3 NIST 6.23538112e-45 wd 0.225358 [ -6 -4 -3 ] |
Atomic unit of time
2.42655250385524e-17 s NIST 2.418884326505e-17 wd -0.725310 [ -4.5 0.5 1 ] |
Atomic unit of velocity
2.1773421580727e6 m s-1 NIST 2.187691253e6 wd 0.476137 [ 3.5 -1.5 0 ] |
Planck angular frequency
1.86138900043917e43 s-1 NIST 1.85487e43 wd -0.350222 [ -1.5 1.5 -2 ] |
Planck charge
1.87565899199397e-18 C NIST 1.8756459e-18 wd -0.000698 [ -2.5 -1 -1 ] |
Planck current
3.49133101626580e25 A NIST 3.479e25 wd -0.353190 [ -4 0.5 -3 ] |
Planck energy
1.92351934571001e19 GeV NIST 1.956e19 wd 1.688606 [ -7 5 -2 ] |
Planck force
1.215000000000000e44 N NIST 1.21027e44 wd -0.389300 [ -1 5 0 ] |
Planck length
1.61169964971974e-35 m NIST 1.616e-35 wd 0.266821 [ 1.5 -0.5 2 ] |
Planck mass
2.17655923708106e-23 kg NIST 2.1767e-23 wd 0.006467 [ 2 0.5 1 ] |
Planck power
3.64500000000000e-8 kg NIST 3.62831e-8 wd -0.457888 [ -1 6 0 ] |
Planck pressure
4.66232216223940e113 pa NIST 4.63309e113 wd -0.626987 [ 3 10 2 ] |
Planck temperature
1.41471060526129e32 K NIST 1.41679e32 wd 0.146984 [ 2 -2 1 ] |
Planck time
5.37233216573248e-44 s NIST 5.3906e-44 wd 0.340035 [ 1.5 -1.5 2 ] |
Planck voltage
1.03374167891586e27 V NIST 1.04295e27 wd 0.890776 [ -4 1.5 -1 ] |
ratio of inscribed sphere volume to rhombic dodecahedron volume
7.34846922834957e-1 [ 0.5 1.5 0 ] |
ratio of rhombic dodecahedron volume to inscribed sphere volume
1.35047447423567 [ 0.5 1 -1 ] |
Sphere volume with diameter 1 V = 4/3 π r3
5.23598775598298e-1 [ -1 -1 1 ] |
Sphere volume with diameter √2
1.48096097938613 [ 0.5 -1 1 ] |
Sphere volume with diameter √3
2.72069904635133 [ -1 0.5 1 ] |
Sphere volume with radius π
1.29878788045337e1 [ 2 -1 4 ] |
Sphere volume with radius 1
4.188790204786391 [ 2 -1 1 ] |
Sphere volume with radius √2
1.18476878350890e1 [ 3.5 -1 1 ] |
Sphere volume with radius √3
2.17655923708106e1 [ 2 0.5 1 ] |
Sphere with volume radius 2
3.35103216382911e1 [ 5 -1 1 ] |
tetrahedron volume with edge 1 V = √2 /12 a3
1.17851130197758e-1 [ -1.5 -1 0 ] |
tetrahedron volume with edge √2
3.33333333333333e-1 [ 0 -1 0 ] |
tetrahedron volume with edge √3
6.12372435695783e-1 [ -1.5 0.5 0 ] |
tetrahedron volume with edge 2
1.76776695286636 [ -2.5 0 0 ] |
1/2 octahedron volume with edge 1
2.35702260305515e-1 [-0.5 -1 0 ] |
octahedron volume with edge 1 V = 1/3 √2 a3
4.71404520791033e-1 [ 0.5 -1 0 ] |
octahedron volume with edge √2
1.33333333333333 [ 2 -1 0 ] |
octahedron volume with edge √3
2.449489742178319 [ 0.5 0.5 0 ] |
octahedron volume with edge 2
3.77123616632827 [ 3.5 -1 0 ] |