constants.f90

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module constants
    use,intrinsic :: iso_fortran_env, only: dp => real64
    implicit none
    real(dp), parameter :: &
        pi=3.1415926535897932384626433832795028841971693993751058209749445923&
            &078164062862089986280348253421170679_dp,&  !<pi
        sigmab=5.67037321e-8_dp,&       
        kb=1.380648813e-23_dp,&         
        rg=8.31446218_dp,&              
        na=rg/kb                        
end module constants