Editing Hypersonic speed (section)

===Dissociated gas===
In this regime, diatomic or polyatomic gases (the gases found in most atmospheres) begin to [[dissociation (chemistry)|dissociate]] as they come into contact with the [[Shock wave|bow shock]] generated by the body. [[catalysis|Surface catalysis]] plays a role in the calculation of surface heating, meaning that the type of surface material also has an effect on the flow. The lower border of this regime is where any component of a gas mixture first begins to dissociate in the stagnation point of a flow (which for nitrogen is around 2000 K). At the upper border of this regime, the effects of [[ionization]] start to have an effect on the flow.{{cn|date=October 2014}}