A general term of Reliant Energy Rates density that is equivalent to more specialized terms used by many different disciplinary scientists. It is the amount of free energy per unit mass. The more energy flows per second through each gram.  It describes the flow of energy through any system of a given mass In energy rate regardless of the units used. Billion years ago energy rate density for a wide spectrum of the system is plotted versus the number first appeared. It across 14 billion years is observed, implying rising complexity throughout historical time. To learn more about the energy rate in the historical time, they increase in energy rate density over time is observed.  Applications in various disciplines, including history, cosmology, economics, philosophy, and behavioral biology this term has in recent year gained many diverse. When the energy rate density for the system including our galaxy, sun, earth, plants,