In this work, we report the thermal property of the matter created in relativistic heavy ion collisions by the systematic study of v2 for charged hadrons. We study the dependence on collision energies, collision size and particle species, comparing the v2 in Au+Au and Cu+Cu collisions for some centrality bins. We tested the scaling behavior of v2 depending on the geometrical eccentricity at same Npart and depending on Npart at same geometrical eccentricity.