Constants.h

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#ifndef SimTK_SimTKCOMMON_CONSTANTS_H_
#define SimTK_SimTKCOMMON_CONSTANTS_H_

/* -------------------------------------------------------------------------- *
 *                      SimTK Core: SimTKcommon                               *
 * -------------------------------------------------------------------------- *
 * This is part of the SimTK Core biosimulation toolkit originating from      *
 * Simbios, the NIH National Center for Physics-Based Simulation of           *
 * Biological Structures at Stanford, funded under the NIH Roadmap for        *
 * Medical Research, grant U54 GM072970. See https://simtk.org.               *
 *                                                                            *
 * Portions copyright (c) 2006-7 Stanford University and the Authors.         *
 * Authors: Michael Sherman                                                   *
 * Contributors:                                                              *
 *                                                                            *
 * Permission is hereby granted, free of charge, to any person obtaining a    *
 * copy of this software and associated documentation files (the "Software"), *
 * to deal in the Software without restriction, including without limitation  *
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,   *
 * and/or sell copies of the Software, and to permit persons to whom the      *
 * Software is furnished to do so, subject to the following conditions:       *
 *                                                                            *
 * The above copyright notice and this permission notice shall be included in *
 * all copies or substantial portions of the Software.                        *
 *                                                                            *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,   *
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL    *
 * THE AUTHORS, CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,    *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR      *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE  *
 * USE OR OTHER DEALINGS IN THE SOFTWARE.                                     *
 * -------------------------------------------------------------------------- */

    /**************************/
    /* MATHEMATICAL CONSTANTS */
    /**************************/


#define SimTK_PI     3.141592653589793238462643383279502884197169399375105820974944592L

#define SimTK_E      2.718281828459045235360287471352662497757247093699959574966967628L

#define SimTK_LN2    6.931471805599453094172321214581765680755001343602552541206800095e-1L

#define SimTK_LN10   2.302585092994045684017991454684364207601101488628772976033327901L

#define SimTK_LOG2E  1.442695040888963407359924681001892137426645954152985934135449407L

#define SimTK_LOG10E 4.342944819032518276511289189166050822943970058036665661144537832e-1L

#define SimTK_SQRT2  1.414213562373095048801688724209698078569671875376948073176679738L

#define SimTK_SQRT3  1.732050807568877293527446341505872366942805253810380628055806979L

#define SimTK_CBRT2  1.259921049894873164767210607278228350570251464701507980081975112L

#define SimTK_CBRT3  1.442249570307408382321638310780109588391869253499350577546416195L

    /**********************/
    /* PHYSICAL CONSTANTS */
    /**********************/


#define SimTK_AVOGADROS_NUMBER 6.0221415e23L

#define SimTK_MASS_OF_PROTON_IN_MD 1.00727646688L

#define SimTK_MASS_OF_NEUTRON_IN_MD 1.00866491560L

#define SimTK_MASS_OF_ELECTRON_IN_MD 5.4857990945e-4L

#define SimTK_CHARGE_OF_PROTON_IN_SI 1.60217653e-19L

#define SimTK_CHARGE_OF_PROTON_IN_MD 1.L

#define SimTK_MOLAR_CHARGE_IN_SI 9.6485338e+4L

#define SimTK_MOLAR_CHARGE_IN_MD SimTK_AVOGADROS_NUMBER

#define SimTK_LIGHTSPEED_IN_SI 2.99792458e+8L

#define SimTK_LIGHTSPEED_IN_MD 2.99792458e+5L

#define SimTK_GRAVITATIONAL_CONSTANT_IN_SI 6.6742e-11L   

#define SimTK_GRAVITATIONAL_CONSTANT_IN_MD 1.10827e-34L

#define SimTK_MAGNETIC_PERMEABILITY_IN_SI  \
    1.256637061435917295385057353311801153678867759750042328389977837e-6L

#define SimTK_MAGNETIC_PERMEABILITY_IN_MD   1.94259179e-8L

#define SimTK_ELECTRIC_PERMITTIVITY_IN_SI  \
    8.854187817620389850536563031710750260608370166599449808102417149e-12L  /* approx of exact */

#define SimTK_ELECTRIC_PERMITTIVITY_IN_MD 5.7276575e-4L

#define SimTK_COULOMB_CONSTANT_IN_SI 8.9875517873681764e+9L

#define SimTK_COULOMB_CONSTANT_IN_MD 1.38935456e+2L

#define SimTK_COULOMB_CONSTANT_IN_KCAL_ANGSTROM 3.32063711e+2L

#define SimTK_MOLAR_GAS_CONSTANT_SI 8.314472L

#define SimTK_MOLAR_GAS_CONSTANT_MD 8.314472e-3L

#define SimTK_MOLAR_GAS_CONSTANT_KCAL_ANGSTROM 1.9872065e-3L

#define SimTK_BOLTZMANN_CONSTANT_SI  1.3806505e-23L

#define SimTK_BOLTZMANN_CONSTANT_MD  SimTK_MOLAR_GAS_CONSTANT_MD

#define SimTK_BOLTZMANN_CONSTANT_KCAL_ANGSTROM SimTK_MOLAR_GAS_CONSTANT_KCAL_ANGSTROM

    /***************************/
    /* UNIT CONVERSION FACTORS */
    /***************************/


#define SimTK_RADIAN_TO_DEGREE 5.729577951308232087679815481410517033240547246656432154916024386e+1L

#define SimTK_DEGREE_TO_RADIAN 1.745329251994329576923690768488612713442871888541725456097191440e-2L

#define SimTK_KCAL_TO_KJOULE 4.184L /* exact */

#define SimTK_KJOULE_TO_KCAL 2.390057361376673040152963671128107074569789674952198852772466539e-1L

#define SimTK_DALTON_TO_GRAM     1.66053886e-24L

#define SimTK_E_TO_COULOMB       SimTK_CHARGE_OF_PROTON_IN_SI

#define SimTK_EV_TO_JOULE        SimTK_CHARGE_OF_PROTON_IN_SI

#endif /* SimTK_SimTKCOMMON_CONSTANTS_H_ */

---