On the kinematics of H II regions: Yesterday, today, and tomorrow

The study of the kinematics and dynamics of H II regions provides us with clues about the physical conditions of the gas, the interpretation of their emission spectra, and the exchange of mechanical energy between the ionizing stars and the ionized gas. We discuss in our presentation the past, present and future research in this field. We briefly review the theoretical and observational advances performed during the last decades, including the study of the effects of the environment in the kinematics, the champagne model, the supersonic motions observed in Giant Extragalactic H II Regions, and the effects of turbulence and virialization of the gas. Then, we discuss in detail how Fabry-Perot observations, both at single regions and sampling complete galaxies, could lead us to a better understanding of the physical state of the gas.