Constants
=========

.. code::

    >>> from PhysicalQuantities.constants import *

This defines some commonly used constants:

.. code::

    c0 = PhysicalQuantity(299792458., 'm/s')
    mu0 = PhysicalQuantity(4*np.pi*1e-7,'N/A**2')
    eps0 = PhysicalQuantity(8.854188e-12, 'F/m')
    Grav = PhysicalQuantity(6.67384e-11,'m**3/kg/s**2')
    hpl = PhysicalQuantity(6.62606957e-34, 'J*s')
    hbar = PhysicalQuantity(6.62606957e-34/(2*pi) ,'J*s')
    e0 = PhysicalQuantity(1.602176565e-19, 'C')
    me = PhysicalQuantity(9.10938291e-31, 'kg')
    mp = PhysicalQuantity(1.672621777e-27, 'kg')
    mn = PhysicalQuantity(1.674927351e-27, 'kg')
    NA = PhysicalQuantity(6.02214129e23, '1/mol')
    kb = PhysicalQuantity(1.3806488e-23, 'J/K')
    g0 = PhysicalQuantity(9.80665, 'm/s**2')
    R = PhysicalQuantity(8.3144621, 'J/mol/K')
    Ry = PhysicalQuantity(10973731.568539, '1/m')
    mu_n = PhysicalQuantity(-0.96623647e-26, 'J/T')
    gamma = PhysicalQuantity(183.247179, 'MHz/T')
    sigmaT = PhysicalQuantity(6.652453e-29, 'm**2')