quanta.constants - Function

get a constant

Synopsis
constants(v)

Arguments

v	in	name
		Allowed:	coded string
		Default:	'pi'

Returns
quantity

Description
constants gets a named constant quantity. Names (no-case, minimax) are:

        pi    3.14..                    3.14159 
        ee    2.71..                    2.71828 
        c     light vel.                2.99792e+08 m/s
        G     grav. const               6.67259e-11 N.m2/kg2
        h     Planck const              6.62608e-34 J.s
        HI    HI line                   1420.41 MHz
        R     gas const                 8.31451 J/K/mol
        NA    Avogadro #                6.02214e+23 mol-1
        e     electron charge           1.60218e-19 C
        mp    proton mass               1.67262e-27 kg
        mp_me mp/me                     1836.15 
        mu0   permeability vac.         1.25664e-06 H/m
        eps0  permittivity vac.         1.60218e-19 C
        k     Boltzmann const           1.38066e-23 J/K
        F     Faraday const             96485.3 C/mol
        me    electron mass             9.10939e-31 kg
        re    electron radius           2.8179e-15 m
        a0    Bohr's radius             5.2918e-11 m
        R0    solar radius              6.9599e+08 m
        k2    IAU grav. const^2         0.000295912 AU3/d2/S0

Example

- dq.constants()
[value=3.14159, unit=]

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	Package	general
	Module	quanta
	Tool	quanta