In the last years, the liquid metallic hydrogen model has proven to be a viable alternative to the standard solar model, almost exclusively due to the work of Pierre-Marie Robitaille (2002, 2009, 2011, 2013). By modeling the density of both the liquid metallic and the molecular state of hydrogen from first principles, the pressure at the phase transition can be estimated, resulting in about 550 GPa. In the liquid metallic hydrogen model, this phase transition defines the photosphere which can therefore be considered real surface, as it is consistent with many observations. However, considerable pressure must be exerted by the above chromosphere, which is assumed to consist of molecular hydrogen, albeit in a compressed, liquid form. Deriving a relation between pressure and density from the above considerations, it can be shown that the chromosphere has an approximate thickness of not more than 8000 km, in agreement with observations.