#ifndef TPX_METHANE_H
#define TPX_METHANE_H

#include "Sub.h"

namespace tpx {

    class methane : public Substance{
    public:
        methane() {
          m_name = "methane";
          m_formula = "CH4";
        }
        virtual ~methane() {}

        double MolWt();
        double Tcrit();
        double Pcrit();
        double Vcrit();
        double Tmin();
        double Tmax();
        char * name();
        char * formula();

        double Pp();
        double up();
        double sp();
        double Psat();

    private:
        double ldens();
        double C(int i, double rt, double rt2);
        double Cprime(int i, double rt, double rt2, double rt3);
        double I(int i, double egrho);
        double H(int i, double egrho);
        double W(int i, double egrho);
    };
}
#endif // ! METHANE_H