> #+TBLFM: $s=uconvert($W*$l/$Z,kg / cm^2)::$cs=uconvert($s_lim/$s, )
>
> where uconvert is defined as:
>
> (defmath uconvert (v u)
>   "Convert value V to compatible unit U."
>   (math-convert-units v u))
>
>
> But no luck, "cs" result is an ERROR. Is it feasible to get a value 
> for "cs" with no units?
>
Ok, it is enough to add any unit to uconvert, for example: 
$cs=uconvert($s_lim/$s,m). That simplifies units in adimensional parameters.

Best regards ;D