This law follows simply from statistics: if a physical system is given (is allowed to occupy) new energy states which are equivalent to the existing states (say, a gas is expanding into a larger volume), then the system will occupy "new" states on equal footing with the existing ("old") ones.
Doctor of Philosophy | philosophy | Physics | physics | Philosophy | Institute of Physics | Nobel Prize in Physics | particle physics | Jewish philosophy | Diagnostic and Statistical Manual of Mental Disorders | Applied Physics Laboratory | mathematical physics | Statistical significance | American Institute of Physics | nuclear physics | International Physics Olympiad | Condensed matter physics | Indian philosophy | Chinese philosophy | Nuclear Physics | Islamic philosophy | Indian Statistical Institute | American Statistical Association | University of Belgrade Faculty of Philosophy | Royal Statistical Society | Princeton Plasma Physics Laboratory | Plasma (physics) | Physics | Moscow Institute of Physics and Technology | International Statistical Institute |