public subroutine mus_set_convFac(me, minLevel, maxLevel)
This routine computed conversion factors for lattice to physical units.
inverse of this factors can be used to convert from physical to lattice
use reference density to parmeterize kg and reference mole density
to parmeterize mol.\n
Multiply these factors with the LB quantity to get the physical quantity
Divide the physical quantity by these factors to get the LB units.
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