Physical constants used by Cantera. More...

Collaboration diagram for Physical Constants:

Detailed Description

Physical constants used by Cantera.

Cantera uses the MKS system of units. The unit for moles is defined to be the kmol. All values of physical constants are consistent with the 2018 CODATA recommendations.

Numerical Constants
const double	Pi = 3.14159265358979323846
	Pi.

const double	Sqrt2 = 1.41421356237309504880
	Sqrt(2)

Defined Constants
These constants are defined by CODATA to have a particular value; see NIST Reference on Constants, Units, and Uncertainty.
const double	Avogadro = 6.02214076e26
	Avogadro's Number \( N_{\mathrm{A}} \) [number/kmol].

const double	Boltzmann = 1.380649e-23
	Boltzmann constant \( k \) [J/K].

const double	Planck = 6.62607015e-34
	Planck constant \( h \) [J-s].

const double	ElectronCharge = 1.602176634e-19
	Elementary charge \( e \) [C].

const double	lightSpeed = 299792458.0
	Speed of Light in a vacuum \( c \) [m/s].

const double	OneAtm = 1.01325e5
	One atmosphere [Pa].

const double	OneBar = 1.0E5
	One bar [Pa].

Measured Constants
These constants are measured and reported by CODATA
const double	fineStructureConstant = 7.2973525693e-3
	Fine structure constant \( \alpha \) [].

const double	ElectronMass = 9.1093837015e-31
	Electron Mass \( m_e \) [kg].

Derived Constants
These constants are found from the defined and measured constants
const double	GasConstant = Avogadro * Boltzmann
	Universal Gas Constant \( R_u \) [J/kmol/K].

const double	logGasConstant = std::log(GasConstant)

const double	GasConst_cal_mol_K = GasConstant / 4184.0
	Universal gas constant in cal/mol/K.

const double	StefanBoltz = 2.0 * std::pow(Pi, 5) * std::pow(Boltzmann, 4) / (15.0 * std::pow(Planck, 3) * lightSpeed * lightSpeed)
	Stefan-Boltzmann constant \( \sigma \) [W/m2/K4].

const double	Faraday = ElectronCharge * Avogadro
	Faraday constant \( F \) [C/kmol].

const double	permeability_0 = 2 * fineStructureConstant * Planck / (ElectronCharge * ElectronCharge * lightSpeed)
	Permeability of free space \( \mu_0 \) [N/A2].

const double	epsilon_0 = 1.0 / (lightSpeed * lightSpeed * permeability_0)
	Permittivity of free space \( \varepsilon_0 \) [F/m].

Variable Documentation

◆ Pi

const double Pi = 3.14159265358979323846

Pi.

Definition at line 70 of file ct_defs.h.

◆ Sqrt2

const double Sqrt2 = 1.41421356237309504880

Sqrt(2)

Definition at line 73 of file ct_defs.h.

◆ Avogadro

const double Avogadro = 6.02214076e26

Avogadro's Number \( N_{\mathrm{A}} \) [number/kmol].

Definition at line 83 of file ct_defs.h.

◆ Boltzmann

const double Boltzmann = 1.380649e-23

Boltzmann constant \( k \) [J/K].

Definition at line 86 of file ct_defs.h.

◆ Planck

const double Planck = 6.62607015e-34

Planck constant \( h \) [J-s].

Definition at line 89 of file ct_defs.h.

◆ ElectronCharge

const double ElectronCharge = 1.602176634e-19

Elementary charge \( e \) [C].

Definition at line 92 of file ct_defs.h.

◆ lightSpeed

const double lightSpeed = 299792458.0

Speed of Light in a vacuum \( c \) [m/s].

Definition at line 95 of file ct_defs.h.

◆ OneAtm

const double OneAtm = 1.01325e5

One atmosphere [Pa].

Definition at line 98 of file ct_defs.h.

◆ OneBar

const double OneBar = 1.0E5

One bar [Pa].

Definition at line 101 of file ct_defs.h.

◆ fineStructureConstant

const double fineStructureConstant = 7.2973525693e-3

Fine structure constant \( \alpha \) [].

Definition at line 110 of file ct_defs.h.

◆ ElectronMass

const double ElectronMass = 9.1093837015e-31

Electron Mass \( m_e \) [kg].

Definition at line 113 of file ct_defs.h.

◆ GasConstant

const double GasConstant = Avogadro * Boltzmann

Universal Gas Constant \( R_u \) [J/kmol/K].

Definition at line 122 of file ct_defs.h.

◆ logGasConstant

const double logGasConstant = std::log(GasConstant)

Definition at line 124 of file ct_defs.h.

◆ GasConst_cal_mol_K

const double GasConst_cal_mol_K = GasConstant / 4184.0

Universal gas constant in cal/mol/K.

Definition at line 127 of file ct_defs.h.

◆ StefanBoltz

const double StefanBoltz = 2.0 * std::pow(Pi, 5) * std::pow(Boltzmann, 4) / (15.0 * std::pow(Planck, 3) * lightSpeed * lightSpeed)

Stefan-Boltzmann constant \( \sigma \) [W/m2/K4].

Definition at line 130 of file ct_defs.h.

◆ Faraday

const double Faraday = ElectronCharge * Avogadro

Faraday constant \( F \) [C/kmol].

Definition at line 133 of file ct_defs.h.

◆ permeability_0

const double permeability_0 = 2 * fineStructureConstant * Planck / (ElectronCharge * ElectronCharge * lightSpeed)

Permeability of free space \( \mu_0 \) [N/A2].

Definition at line 136 of file ct_defs.h.

◆ epsilon_0

const double epsilon_0 = 1.0 / (lightSpeed * lightSpeed * permeability_0)

Permittivity of free space \( \varepsilon_0 \) [F/m].

Definition at line 139 of file ct_defs.h.