According to Ahmad Dallal, Abū Rayhān al-Bīrūnī also states that "there is no observable evidence that rules out the possibility of vacuum".
Ahmad Dallal에 의해, Abū Rayhān al-Bīrūnī 또한 “ 진공의 가능성을 배제하는 증거는 찾을 수 없다”(there is no observable evidence that rules out the possibility of vacuum)라고 말했다."