  We use the fractional integrals to describe fractal solid. We suggest to
consider the fractal solid as special (fractional) continuous medium. We
replace the fractal solid with fractal mass dimension by some continuous model
that is described by fractional integrals. The fractional integrals are
considered as approximation of the integrals on fractals. We derive fractional
generalization of the action functional and the Euler-Lagrange equation for the
fractal solid string.The solution of wave equation for fractal solid string is
considered.

Classical Physics