Q:  What is the typical velocity of electrons in an HII region?


                    (   3 (1.38 x 10^(-23) J/K) * 10^4 K )
          v  =  sqrt(  --------------------------------  )
                    (         9.1 x 10^(-31) kg          )


             =  6.7 x 10^(5)  m/s

  
             =  0.002 c


       Not relativistic, thank goodness!