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In this text to find the answer of the question “ what is it to be physical” in a definition form or a scheme of the term physical, firstly we sought for a possible consensus among recent physicists and philosophers. But from their answers not only we did not find any clear consensus but also most of them confess that the term is ambiguous and unclear. In a general aspect, we can categorize the answers to two theoretical and realistic perspective. The theoretical perspective, beside circularity and Hempel’s triviality, seems not to present any criteria for being physical. In realistic perspective, it seems that there is no ontologic constraint for being physical, that is from “being... 

In an official announcement during the inaugural speech in 2012, where Hempel Award presented on behalf of the Philosophy of Science Association to Bas van Fraassen for “a lifetime scholarly achievement in the philosophy of science”, it was said that, “van Fraassen advocates a semantic approach to scientific theories and, on that basis, urges skepticism regarding laws of nature, anti-realism regarding unobservables, and pragmatism regarding explanation” (Gonzalez 2014, 5). van Fraassen’s approach to unobservable entities has a crucial role in his philosophy of science and also in this dissertation. The aim here is to defend van Fraassen’s claim based upon the distinction he makes between...