• The laws of thermodynamics may be regarded as particular cases of more general laws, applicable to all such states of matter as constitute Energy , or the capacity to perform work, which more general laws form the basis of the science of energetics, a science comprehending, as special branches, the theories of motion, heat, light , electricity , and all other physical phenomena.

    William John Macquorn Rankine (1869). “A Manual of the Steam Engine and Other Prime Movers by William John Macquorn Rankine”, p.32