there is something which remains constant

An example of a potential tautology

"There only remains for us one enunciation of the principle of the conservation of energy: There is something which remains constant. Under this form it is in its turn out of reach of experiment and reduces to a sort of tautology."

Henri Poincaré (1902) Science and Hypothesis

There is a danger that we define energy as that which is always conserved according to the conservation principle.

Read about tautology

Author: Keith

Former school and college science teacher, teacher educator, research supervisor, and research methods lecturer. Emeritus Professor of Science Education at the University of Cambridge.