EFIRI jahoni, muhiti farziero nomand, ki ba aqidai tabiatshinosoni asrhoi guzashta guyo vositai az joe ba joe pahn gashtani rushnoi va umuman tasiroti mutaqobili elektromagniti budaast. «Asosi» aqidai tabiatshinosoni peshina dar borai E. in bud: «Sado dar muhiti chandir pahn meshavad. Misli hamin, baroi pahn gardidani rushnoi niz boyad muhiti bagoyat chandir (efir) mavjud boshad. Va azbaski rushnoi dar vakuum ham pahn shuda metavonad, pas vakuum ham puri E. ast».
Hamin tariq, E., az yak taraf, chun muhiti bagoyat chandir tasavvur meshudu (zero har qadare ki muhit chandirtar boshad, surati rafti mavjho dar on hamon qadar ziyodtar buda metavonad), az tarafi digar, qismhoi dar on harakatkunanda (mas., sayyoraho)-ro tamoman mone namegasht. Ammo in aqida ba baze khulosahoi tajribavii okh. a. 19 mukholifat paydo kard. Mas, iloje yoft nashud, ki arziyati mavjhoi rushnoi (baroi in E. boyad khususiyathoi jismi mutlaq sakhtro sohib boshad) va khosiyati bemuqobilati E.-ro sozish dihad. Nazariyai nisbiyat mafhumi «E.» va khosiyathoi rushnoi-naqlkunandagii onro az miyon badoshtand, tesha bar reshai aqidae zad, ki guyo mafhumhoi «orom» va «ravon» mutlaq boshand: in nazariya sobit kard, ki mafhumhoi «oromu» «ravon» nisbiyand va kharakteri on ho tanho ba intikhobi sistemai sarhisob vobasta meboshad.
S. Qodiri.