Any restoration of mechanical energy, without more than an equivalent of dissipation, is impossible in inanimate material processes, and is probably never effected by means of organized matter, either endowed with vegetable life, or subjected to the will of an animated creature.
William Thomson, 1st Baron Kelvin
There is at present in the material world a universal tendency to the dissipation of mechanical energy.
William Thomson, 1st Baron Kelvin
All these reckonings of the history of underground heat, the details of which I am sure you do not wish me to put before you at present, are founded on the very sure assumption that the material of our present solid earth all round its surface was at one time a white-hot liquid.
William Thomson, 1st Baron Kelvin
