MUHARRIKI ABADI, perpetuum mobile (lot. Regpetuum mobile, aynan-harakati abadi), moshini khayoliest, ki badi yak marotiba ba kor darovardan be istifodai energiyai beruna muddati daroz (abadi) muttassil kor karda metavonad. Chunin Muharriki abadi Muharriki abadii navi 1 nomida meshavad. Muharriki abadi ba qonuni baqo va badalshavii energiya muolif ast, az in ru, sokhtani on gayri imkon meboshad. Moshini khayolii davri amalkunanda, ki garmii jismhoi ihotakunanda (uqyonus, davoe digar manbahoi tabiii garmi, ki amalan tamomnashavandaand)-ro girifta, onro purra ba kor tabdil doda tavonad, Muharriki abadii navi 2 nomida meshavad. Vale sokhtani Muharriki abadii navi 2 ham aslan imkonnopazir meboshad. Kori vay zohiran ba qonuni baqoi energiya zid naboshad ham, vale ba qonuni duyumi termodinamika mukholif ast. Mekhanizmhoe, ki az zakhirahoi energiyai tabii (energiyai Oftob, energiyai yadro va gayra) duru daroz kor karda metavonand, bo goyai Muharriki abadi umumiyate nadorand.