  We investigate the properties of features seen within superluminal sources
often referred to as components. Our result indicates a fairly strong
correlation of r=0.6 for quasars, r=0.4 for galaxies, and r=0.8 for BL Lac
objects in our sample between component sizes and distances from the stationary
core. Assumption of free adiabatic expanding plasma enabled us to constrain in
general the Lorentz factor for superluminal sources. Ourestimated Lorentz
factor of 7 - 17 for quasars, 6 - 13 for galaxies and 4- 9 for BL Lac objects
indicate that BL Lac have the lowest range of Lorentz factor.
