1.5.1.0 quanta.constants

NRAO Home > CASA > CASA Toolkit Reference Manual

quanta.constants - Function

1.5.1 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 number 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 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}
#
"""

__________________________________________________________________

[next] [prev] [prev-tail] [front] [up]

More information about CASA may be found at the CASA web page

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