force Scientific notation when using symunit

hello format short and all the other formate solutions does not work when using units so how do i force it to show the result in scientific notation

as i only need enginers notation of scientific notation for all my work with or without units it is sort of essential to my work with matlab

so please help

u = symunit
Z=2
m=85.468*u.g/u.mol
%m=85.468*u.g/mol
a=5.605*u.Ao
NAVO=6.02214076*10^(23)*u.mol^(-1)

now using all these format options does not make the result to be shown in sicentific notation

format short E
format shortEng
format compact
format short e
den = Z*m/(NAVO*a^3)                    % is a fraction
den = unitConvert(den,u.g/(u.cm^3))     % is a fraction
simplify(vpa(den))                      % is a decimal number