Constant
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constant math_four_pi
Description
Holds 4*pi.
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constant math_four_pi
mentdb
(12.5663706143591725 ± 8.9E-16)
constant math_half_pi
Description
Holds pi/2.
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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
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constant math_pi
mentdb
(3.1415926535897931 ± 2.2E-16)
constant math_pi_square
Description
Holds pi^2
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constant math_pi_square
mentdb
(9.869604401089358 ± 8.9E-16)
constant math_two_pi
Description
Holds 2*pi
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constant math_two_pi
mentdb
(6.2831853071795862 ± 4.4E-16)
constant physics_a0
Description
Holds the Bohr radius (α/(4π·Rinf))
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constant physics_a0
mentdb
(5.291772E-11 ± 1.8E-17) m
constant physics_amu
Description
Holds the unified atomic mass unit (0.001 kg/mol)/N
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constant physics_amu
mentdb
(1.6605389E-27 ± 2.8E-34) kg
constant physics_bohr_magneton
Description
Holds the Bohr magneton (ℏ·e/2me)
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constant physics_bohr_magneton
mentdb
(9.274009E-24 ± 4.0E-30) C·J·s/kg
constant physics_c
Description
Holds the speed of light in vacuum (exact).
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constant physics_c
mentdb
299792458 m/s
constant physics_c_square
Description
Holds c^2.
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constant physics_c_square
mentdb
89875517873681764 m²/s²
constant physics_e
Description
Holds the elementary charge (positron charge).
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constant physics_e
mentdb
(1.6021765E-19 ± 1.4E-26) C
constant physics_eh
Description
Holds the Hartree energy (2Rinf·h·c)
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constant physics_eh
mentdb
(4.3597442E-18 ± 7.2E-25) J
constant physics_f
Description
Holds the Faraday constant (N·e)
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constant physics_f
mentdb
(96485.34 ± 0.024) C/mol
constant physics_fine_structure
Description
Holds the fine structure constant (e²/(2·ε0·c·h))
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constant physics_fine_structure
mentdb
(0.007297353 ± 2.5E-9)
constant physics_g
Description
Holds the standard acceleration due to gravity (approximately equal to the acceleration due to gravity on the Earth's surface).
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constant physics_g
mentdb
(9.8066499999999976 ± 8.9E-16) m/s²
constant physics_g0
Description
Holds the conductance quantum (2e²/h)
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constant physics_g0
mentdb
(0.00007748092 ± 2.6E-11) S
constant physics_k
Description
Holds the Boltzmann constant.
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constant physics_k
mentdb
(1.380651E-23 ± 2.4E-29) J/K
constant physics_lp
Description
Holds the Planck length (ℏ/(mP·c))
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constant physics_lp
mentdb
(1.6162E-35 ± 1.2E-39) m
constant physics_m_deuteron
Description
Holds the deuteron rest mass.
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constant physics_m_deuteron
mentdb
(3.3435833E-27 ± 5.7E-34) kg
constant physics_m_electron
Description
Holds the electron rest mass.
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constant physics_m_electron
mentdb
(9.109383E-31 ± 1.6E-37) kg
constant physics_m_muon
Description
Holds the muon rest mass.
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constant physics_m_muon
mentdb
(1.8835314E-28 ± 3.3E-35) kg
constant physics_m_neutron
Description
Holds the neutron rest mass.
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constant physics_m_neutron
mentdb
(1.6749273E-27 ± 2.9E-34) kg
constant physics_m_proton
Description
Holds the proton rest mass.
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constant physics_m_proton
mentdb
(1.6726217E-27 ± 2.9E-34) kg
constant physics_magn_flux_quantum
Description
Holds the magnetic flux quantum (h/2e)
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constant physics_magn_flux_quantum
mentdb
(2.0678337E-15 ± 5.2E-22) Wb
constant physics_mp
Description
Holds the Planck mass (ℏ·c/G)1/2
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constant physics_mp
mentdb
(2.1765E-8 ± 1.6E-12) kg
constant physics_n
Description
Holds the Avogadro constant.
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constant physics_n
mentdb
(6.022142E23 ± 1.0E17) 1/mol
constant physics_newtonian_g
Description
Holds the Newtonian constant of gravitation.
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constant physics_newtonian_g
mentdb
(6.674E-11 ± 1.0E-14) m³/(kg·s²)
constant physics_nuclear_magneton
Description
Holds the nuclear magneton (ℏ·e/2mp)
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constant physics_nuclear_magneton
mentdb
(5.050783E-27 ± 2.2E-33) C·J·s/kg
constant physics_perm_vac_electric
Description
Holds the permeability of vacuum or electric constant.
admin
constant physics_perm_vac_electric
mentdb
(8.854187817620389E-12 ± 2.4E-27) A²·s²/(N·m²)
constant physics_perm_vac_magnetic
Description
Holds the permeability of vacuum or magnetic constant.
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constant physics_perm_vac_magnetic
mentdb
(0.0000012566370614359171 ± 1.1E-22) N/A²
constant physics_planck
Description
Holds the Planck constant.
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constant physics_planck
mentdb
(6.626069E-34 ± 1.1E-40) J·s
constant physics_planck_over_two_pi
Description
Holds the Planck constant over 2*pi.
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constant physics_planck_over_two_pi
mentdb
(1.0545717E-34 ± 1.8E-41) J·s
constant physics_r
Description
Holds the molar gas constant (N·k)
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constant physics_r
mentdb
(8.31447 ± 0.000016) J/(mol·K)
constant physics_rinf
Description
Holds the Rydberg constant (α²·me·c/2h).
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constant physics_rinf
mentdb
(1.097373156852E7 ± 0.000073) 1/m
constant physics_stefan_boltzmann
Description
Holds the Stefan-Boltzmann constant ((π²/60)·k4/(ℏ³·c²))
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constant physics_stefan_boltzmann
mentdb
(5.6704E-8 ± 4.2E-13) J/(K^4·s·m²)
constant physics_tp
Description
Holds the Planck time (lP/c)
admin
constant physics_tp
mentdb
(5.3912E-44 ± 4.1E-48) s
constant physics_z0
Description
Holds the characteristic impedance of vacuum (µ0·c).
admin
constant physics_z0
mentdb
(376.73031346177061 ± 2.8E-14) Ω
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