That theorem equates the average momentum-squared over mass to the average dot product of force with displacement.
In cosmology, a radius described by this adjective is the radius within which the matter density is 200 times the critical density of the universe. A set of numbers described by this adjective can be computed by summing over the contributions of n-body linked cluster diagrams, and the second of those numbers equals half of the excluded volume times one minus the interaction energy over kT. Those numbers are the coefficients in an equation of (*) state described by this adjective, which equates pressure over kT to a power series in density. A theorem named for this adjective applies to two-body systems where the potential energy is some power n of the inter-particle distance. That theorem equates the average momentum-squared over mass to the average dot product of force with displacement. For 10 points, identify this adjective which names a theorem that relates a system's average kinetic and potential energies.
In cosmology, a radius described by this adjective is the radius within which the matter density is 200 times the critical density of the universe.
virial [or virial theorem; or virial expansion; or virial coefficients]