constants.f90

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module constants
    use,intrinsic :: iso_fortran_env, only: dp => real64
    implicit none
    real(dp), parameter :: pi=3.141592653589793238462_dp 
    real(dp), parameter :: sigmab=5.67037321e-8_dp       
    real(dp), parameter :: kb=1.380648813e-23_dp         
    real(dp), parameter :: rg=8.31446218_dp              
    real(dp), parameter :: na=rg/kb                      
end module constants