/* ---------------------------------------- constant.h -------------- */

#ifndef __CONSTANT_H__
#define __CONSTANT_H__

/* Define physical constants. We will use MKS definitions throughout.
 */

#define  SQ(x)        ((x) * (x))
#define  CUBE(x)      ((x) * (x) * (x))

#ifndef PI
#define  PI    3.141592653589
#endif

#define  SQPI  1.772453851

#define  cLight   2.99792458E+08      /* Speed of light [m/s]      */
#define  hPlanck  6.6260755E-34       /* Planck's constant [Js]    */
#define  kBoltz   1.380658E-23        /* Boltzman's constant [J/K] */
#define  mElect   9.1093897E-31       /* Electron mass [kg]        */
#define  mHatom   1.673725E-27        /* H atom mass [kg]          */
#define  G        6.67259E-11         /* Gravitational Constant [N m^2/kg^2] */

#define  aRad     7.565914E-16        /* Radiation constant W/m^4 K^4 */
#define  sigmaT   6.65e-29            /* Thomson cross section in m^2 */

#endif /* !__CONSTANT_H__ */

/* ------- end ---------------------------- constant.h  ------------- */