Other equations of state, started by Beattie and Bridgeman, are more closely related to virial equations, and show to be more accurate in representing behavior of fluids in both gaseous and liquid phases. The Beattie-Bridgeman equation of state, proposed in 1928, p = R T v 2 ( 1 − − c v T 3 ) ( v + B ) − − A v 2 where