  In this paper we apply dimensional analysis (D.A.) to two cosmological
models: Einstein-de Sitter and one Friedmann-Robertson-Walker (FRW) with
radiation predominance. We believe that this method leads to the simplest form
of solution the differential equations that arise in both models and would be
useful as a base for the solution of more complex models. The aim of the paper
is therefore rather pedagogical since it tries to show different dimensional
techniques.
