In thermodynamics, conservative dynamical system is a system consisting of moving molecules in which the total energy of all collisions is conserved. The term was used significantly by English physicist C.G. Darwin’s 1952 book The Next Million Years to describe both an ideal gas system, defined by Boyle’s law, and, by analogy, a system of human molecules, confined to the earth "containing vessel", defined by "the Boyle's law which controls the behavior of those very complicated molecules, the members of the human race." [1]
References
1. Darwin, Charles G. (1952). The Next Million Years (chapter one). London: Rupert Hart-Davis.
