/usr/include/BALL/COMMON/constants.h is in libball1.4-dev 1.4.1+20111206-3.
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// vi: set ts=2:
//
#ifndef BALL_COMMON_CONSTANTS_H
#define BALL_COMMON_CONSTANTS_H
#ifndef BALL_COMMON_GLOBAL_H
# include <BALL/COMMON/global.h>
#endif
namespace BALL
{
/** The constants namespace.
This namespace contains definitions for some basic mathematical and physical constants.
All constants are double precision. \par
There are basically two ways of accessing these constants:
- specify all namespaces: \par
<tt>float my_pi = BALL::Constants::PI</tt>
- shortcut via the <tt>using directive</tt>: \par
<tt>using namespace BALL::Constants; \par
float my_pi = PI;</tt>
\ingroup Common
*/
namespace Constants
{
/** @name Mathematical constants.
*/
//@{
/// PI
BALL_EXTERN_VARIABLE const double PI;
/// Euler's number - base of the natural logarithm
BALL_EXTERN_VARIABLE const double E;
/** Internal theshold for equality comparisons.
Default value is 1e-6.
*/
BALL_EXTERN_VARIABLE double EPSILON;
//@}
/** @name Chemical/physical constants.
*/
//@{
/** Elementary charge.
In units of C (\f$1.60217738 \cdot 10^{-19} C\f$).
*/
BALL_EXTERN_VARIABLE const double ELEMENTARY_CHARGE; // C
/// Elementary charge (alias)
BALL_EXTERN_VARIABLE const double e0;
/** Electron mass.
In units of kg (\f$9.1093897 \cdot 10^{-31}\f$ kg).
*/
BALL_EXTERN_VARIABLE const double ELECTRON_MASS; // kg
/** Proton mass.
In units of kg (\f$1.6726230 \cdot 10^{-27}\f$ kg).
*/
BALL_EXTERN_VARIABLE const double PROTON_MASS; // kg
/** Neutron mass.
In units of kg (\f$1.6749286 \cdot 10^{-27}\f$ kg).
*/
BALL_EXTERN_VARIABLE const double NEUTRON_MASS; // kg
/** Avogadro constant.
In units of \f$mol^{-1}\f$ (\f$6.0221367 \cdot 10^{23} mol^{-1}\f$).
*/
BALL_EXTERN_VARIABLE const double AVOGADRO;
/** Avogadro constant (alias)
*/
BALL_EXTERN_VARIABLE const double NA;
/** Avogadro constant (alias)
*/
BALL_EXTERN_VARIABLE const double MOL;
/** Boltzmann constant.
In units of J/K (\f$1.380657 \cdot 10^{-23}\f$ J/K).
*/
BALL_EXTERN_VARIABLE const double BOLTZMANN;
/** Boltzmann constant (alias)
*/
BALL_EXTERN_VARIABLE const double k;
/** Planck constant.
In units of Js (\f$6.6260754 \cdot 10^{-34}\f$ Js).
*/
BALL_EXTERN_VARIABLE const double PLANCK;
/** Planck constant (alias)
*/
BALL_EXTERN_VARIABLE const double h;
/** Gas constant (= NA * k)
*/
BALL_EXTERN_VARIABLE const double GAS_CONSTANT;
/** Gas constant (alias)
*/
BALL_EXTERN_VARIABLE const double R;
/** Faraday constant (= NA * e0)
*/
BALL_EXTERN_VARIABLE const double FARADAY;
/** Faraday constant (alias)
*/
BALL_EXTERN_VARIABLE const double F;
/** Bohr radius.
In units m (\f$5.29177249 \cdot 10^{-11}\f$ m).
*/
BALL_EXTERN_VARIABLE const double BOHR_RADIUS;
/** Bohr radius (alias)
*/
BALL_EXTERN_VARIABLE const double a0;
// the following values from:
// P.W.Atkins: Physical Chemistry, 5th ed., Oxford University Press, 1995
/** Vacuum permittivity.
In units of \f$C^2J^{-1}m^{-1}\f$ (\f$8.85419 \cdot 10^{-12} C^2J^{-1}m^{-1}\f$).
*/
BALL_EXTERN_VARIABLE const double VACUUM_PERMITTIVITY;
/** Vacuum permeability.
In units of \f$Js^2C^{-2}m^{-1}\f$ (\f$4\pi \cdot 10^{-7} Js^2C^{-2}m^{-1}\f$).
*/
BALL_EXTERN_VARIABLE const double VACUUM_PERMEABILITY;
/** Speed of light.
In units of m/s (\f$2.99792458 \cdot 10^8 ms^{-1}\f$).
*/
BALL_EXTERN_VARIABLE const double SPEED_OF_LIGHT;
/** Speed of Light (alias)
*/
BALL_EXTERN_VARIABLE const double c;
/** Gravitational constant.
In units of \f$Nm^2kg^{-2}\f$ (\f$6.67259 \cdot 10^{-11} Nm^2kg^{-2}\f$).
*/
BALL_EXTERN_VARIABLE const double GRAVITATIONAL_CONSTANT;
/** Fine structure constant.
Without unit (\f$7.29735 \cdot 10^{-3}\f$).
*/
BALL_EXTERN_VARIABLE const double FINE_STRUCTURE_CONSTANT;
//@}
/** @name Conversion factors
*/
//@{
/** Degree per rad.
57.2957795130823209
*/
BALL_EXTERN_VARIABLE const double DEG_PER_RAD;
/** Rad per degree.
0.0174532925199432957
*/
BALL_EXTERN_VARIABLE const double RAD_PER_DEG;
/** mm per inch.
25.4
*/
BALL_EXTERN_VARIABLE const double MM_PER_INCH;
/** m per foot.
3.048
*/
BALL_EXTERN_VARIABLE const double M_PER_FOOT;
/** Joules per calorie.
4.184
*/
BALL_EXTERN_VARIABLE const double JOULE_PER_CAL;
/** Calories per Joule.
1/JOULE_PER_CAL
*/
BALL_EXTERN_VARIABLE const double CAL_PER_JOULE;
//@}
}
}
#endif // BALL_COMMON_CONSTANTS_H
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