In stellar interiors, it dictates that gravitational contraction should result in an increased luminosity.  
In stellar interiors, it dictates that gravitational contraction should result in an increased luminosity.  It can be derived from Boltzmann's transport equation and Liouville's theorema, and the mass given this name can be found in a gravitational system if the system's extent and all the mean square velocities are known. A series given this name is an expansion of the ideal gas law in powes of number density over volume and includes a compressibility factor to indicate deviation from ideal behavior. FTP, identify the shared name given to all these things, with a theorem of this name stating that if time averages are well defined and the system is bounded, the average potential energy will minus one-half times the average kinetic energy.
In stellar interiors, it dictates that gravitational contraction should result in an increased luminosity.  
virial (theorem, expansion)