Constant
constant math_four_piconstant math_half_piconstant math_piconstant math_pi_squareconstant math_two_piconstant physics_a0constant physics_amuconstant physics_bohr_magnetonconstant physics_cconstant physics_c_squareconstant physics_econstant physics_ehconstant physics_fconstant physics_fine_structureconstant physics_gconstant physics_g0constant physics_kconstant physics_lpconstant physics_m_deuteronconstant physics_m_electronconstant physics_m_muonconstant physics_m_neutronconstant physics_m_protonconstant physics_magn_flux_quantumconstant physics_mpconstant physics_nconstant physics_newtonian_gconstant physics_nuclear_magnetonconstant physics_perm_vac_electricconstant physics_perm_vac_magneticconstant physics_planckconstant physics_planck_over_two_piconstant physics_rconstant physics_rinfconstant physics_stefan_boltzmannconstant physics_tpconstant physics_z0
constant math_four_pi
Description
Holds 4*pi.
Holds 4*pi.
admin
constant math_four_pi
mentdb
(12.5663706143591725 ± 8.9E-16)
constant math_half_pi
Description
Holds pi/2.
Holds pi/2.
admin
constant math_half_pi
mentdb
(1.5707963267948966 ± 1.1E-16)
constant math_pi
Description
Holds the ratio of the circumference of a circle to its diameter
Holds the ratio of the circumference of a circle to its diameter
admin
constant math_pi
mentdb
(3.1415926535897931 ± 2.2E-16)
constant math_pi_square
Description
Holds pi^2
Holds pi^2
admin
constant math_pi_square
mentdb
(9.869604401089358 ± 8.9E-16)
constant math_two_pi
Description
Holds 2*pi
Holds 2*pi
admin
constant math_two_pi
mentdb
(6.2831853071795862 ± 4.4E-16)
constant physics_a0
Description
Holds the Bohr radius (α/(4π·Rinf))
Holds the Bohr radius (α/(4π·Rinf))
admin
constant physics_a0
mentdb
(5.29177210544E-11 ± 8.2E-21) m
constant physics_amu
Description
Holds the unified atomic mass unit (0.001 kg/mol)/N
Holds the unified atomic mass unit (0.001 kg/mol)/N
admin
constant physics_amu
mentdb
(1.66053906892E-27 ± 5.2E-37) kg
constant physics_bohr_magneton
Description
Holds the Bohr magneton (ℏ·e/2me)
Holds the Bohr magneton (ℏ·e/2me)
admin
constant physics_bohr_magneton
mentdb
(9.2740100657E-24 ± 2.9E-33) J/T
constant physics_c
Description
Holds the speed of light in vacuum (exact).
Holds the speed of light in vacuum (exact).
admin
constant physics_c
mentdb
299792458 m/s
constant physics_c_square
Description
Holds c^2.
Holds c^2.
admin
constant physics_c_square
mentdb
8.987551787368176E16 m²/s²
constant physics_e
Description
Holds the elementary charge (positron charge).
Holds the elementary charge (positron charge).
admin
constant physics_e
mentdb
1.602176634E-19 C
constant physics_eh
Description
Holds the Hartree energy (2Rinf·h·c)
Holds the Hartree energy (2Rinf·h·c)
admin
constant physics_eh
mentdb
(4.359744722206E-18 ± 4.8E-30) J
constant physics_f
Description
Holds the Faraday constant (N·e)
Holds the Faraday constant (N·e)
admin
constant physics_f
mentdb
96485.33212331001 C/mol
constant physics_fine_structure
Description
Holds the fine structure constant (e²/(2·ε0·c·h))
Holds the fine structure constant (e²/(2·ε0·c·h))
admin
constant physics_fine_structure
mentdb
(0.0072973525643 ± 1.1E-12)
constant physics_g
Description
Holds the standard acceleration due to gravity (approximately equal to the acceleration due to gravity on the Earth's surface).
Holds the standard acceleration due to gravity (approximately equal to the acceleration due to gravity on the Earth's surface).
admin
constant physics_g
mentdb
9.80665 m/s²
constant physics_g0
Description
Holds the conductance quantum (2e²/h)
Holds the conductance quantum (2e²/h)
admin
constant physics_g0
mentdb
7.748091729863649E-5 S
constant physics_k
Description
Holds the Boltzmann constant.
Holds the Boltzmann constant.
admin
constant physics_k
mentdb
1.380649E-23 J/K
constant physics_lp
Description
Holds the Planck length (ℏ/(mP·c))
Holds the Planck length (ℏ/(mP·c))
admin
constant physics_lp
mentdb
(1.6162550244237053E-35 ± 1.8E-40) m
constant physics_m_deuteron
Description
Holds the deuteron rest mass.
Holds the deuteron rest mass.
admin
constant physics_m_deuteron
mentdb
(3.3435837768E-27 ± 1.0E-36) kg
constant physics_m_electron
Description
Holds the electron rest mass.
Holds the electron rest mass.
admin
constant physics_m_electron
mentdb
(9.1093837139E-31 ± 2.8E-40) kg
constant physics_m_muon
Description
Holds the muon rest mass.
Holds the muon rest mass.
admin
constant physics_m_muon
mentdb
(1.883531627E-28 ± 4.2E-36) kg
constant physics_m_neutron
Description
Holds the neutron rest mass.
Holds the neutron rest mass.
admin
constant physics_m_neutron
mentdb
(1.67492750056E-27 ± 8.5E-37) kg
constant physics_m_proton
Description
Holds the proton rest mass.
Holds the proton rest mass.
admin
constant physics_m_proton
mentdb
(1.67262192595E-27 ± 5.2E-37) kg
constant physics_magn_flux_quantum
Description
Holds the magnetic flux quantum (h/2e)
Holds the magnetic flux quantum (h/2e)
admin
constant physics_magn_flux_quantum
mentdb
2.0678338484619295E-15 Wb
constant physics_mp
Description
Holds the Planck mass (ℏ·c/G)^1/2
Holds the Planck mass (ℏ·c/G)^1/2
admin
constant physics_mp
mentdb
(2.1764343427178984E-8 ± 2.4E-13) kg
constant physics_n
Description
Holds the Avogadro constant.
Holds the Avogadro constant.
admin
constant physics_n
mentdb
6.02214076E23 1/mol
constant physics_newtonian_g
Description
Holds the Newtonian constant of gravitation.
Holds the Newtonian constant of gravitation.
admin
constant physics_newtonian_g
mentdb
(6.6743E-11 ± 1.5E-15) m³/(kg·s²)
constant physics_nuclear_magneton
Description
Holds the nuclear magneton (ℏ·e/2mp)
Holds the nuclear magneton (ℏ·e/2mp)
admin
constant physics_nuclear_magneton
mentdb
(5.0507837393E-27 ± 1.6E-36) J/T
constant physics_perm_vac_electric
Description
Holds the permittivity of vacuum, or electric constant.
Holds the permittivity of vacuum, or electric constant.
admin
constant physics_perm_vac_electric
mentdb
(8.8541878188E-12 ± 1.4E-21) A²·s²/(N·m²)
constant physics_perm_vac_magnetic
Description
Holds the permeability of vacuum, or magnetic constant.
Holds the permeability of vacuum, or magnetic constant.
admin
constant physics_perm_vac_magnetic
mentdb
(1.25663706127E-6 ± 2.0E-16) N/A²
constant physics_planck
Description
Holds the Planck constant.
Holds the Planck constant.
admin
constant physics_planck
mentdb
6.62607015E-34 J·s
constant physics_planck_over_two_pi
Description
Holds the Planck constant divided by 2*pi.
Holds the Planck constant divided by 2*pi.
admin
constant physics_planck_over_two_pi
mentdb
1.0545718176461565E-34 J·s
constant physics_r
Description
Holds the molar gas constant (N·k)
Holds the molar gas constant (N·k)
admin
constant physics_r
mentdb
8.31446261815324 J/(mol·K)
constant physics_rinf
Description
Holds the Rydberg constant (α²·me·c/2h).
Holds the Rydberg constant (α²·me·c/2h).
admin
constant physics_rinf
mentdb
(10973731.568157 ± 1.2E-5) 1/m
constant physics_stefan_boltzmann
Description
Holds the Stefan-Boltzmann constant ((π²/60)·k4/(ℏ³·c²))
Holds the Stefan-Boltzmann constant ((π²/60)·k4/(ℏ³·c²))
admin
constant physics_stefan_boltzmann
mentdb
5.6703744191844314E-8 J/(K^4·s·m²)
constant physics_tp
Description
Holds the Planck time (lP/c)
Holds the Planck time (lP/c)
admin
constant physics_tp
mentdb
(5.391246448313605E-44 ± 6.1E-49) s
constant physics_z0
Description
Holds the characteristic impedance of vacuum (µ0·c).
Holds the characteristic impedance of vacuum (µ0·c).
admin
constant physics_z0
mentdb
(376.730313412 ± 5.9E-8) Ω