quanta.constants - Function

1.4.1 get a constant
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

Arguments





Inputs

v

name

allowed:

string

Default:

pi

Returns
record

Example

"""  
#  
print "\t----\t constants Ex 1 \t----"  
print qa.constants()  
#{’unit’: ’’, ’value’: 3.1415926535897931}  
#  
"""

Please send any comments or questions about CASA or AIPS++ to aips2-requests@nrao.edu

Copyright © 2008 Associated Universities Inc., Washington, D.C.

This code is available under the terms of the GNU General Public Lincense


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