Yarman,T.Kholmetskii,A.L.Korfali,O.2024-10-152024-10-15201051992-1950[SCOPUS-DOI-BELIRLENECEK-159]2-s2.0-78549280125https://hdl.handle.net/20.500.14517/6709In this paper, a connection between the long lasting macroscopic classical laws of gases and the quantum mechanical description of non-interacting particles confined in a box was found, thus constituting an ideal gas. In such a gas, the motion of each individual molecule can be considered to be independent of all other molecules, and the macroscopic parameters of an ideal gas, mainly, pressure P and temperature T, can be defined as simple average quantities based on individual motions of all molecules in consideration. It is shown that for an ideal gas enclosed in a macroscopic box of volume V constant V, the constant γ appearing in the classical law of adiabatic expansion law, that is, PVγ = can be derived based on quantum mechanics. Physical implications of the result we disclose are discussed. © 2010 Academic Journals.eninfo:eu-repo/semantics/closedAccessAdiabatic transformationKinetic theory of gasesQuantum mechanicsArticle51015241529