• The two parameters are generally anisotropic for a finite-size system. • The two parameters are calculated for a finite-size ideal Fermi gas. Highlights: • Isobaric thermal expansion coefficient and isothermal compressibility are redefined. Moreover, it is found the thermal expansion coefficient may be negative in some directions under the condition that the pressures in all directions are kept constant. It is found that the isobaric thermal expansion coefficient and isothermal compressibility are generally anisotropic, i.e., they are generally different in different directions. The two parameters are redefined and calculated for a finite-size ideal Fermi gas confined in a rectangular container. International Nuclear Information System (INIS)ĭue to quantum size effects (QSEs), the isobaric thermal expansion coefficient and isothermal compressibility well defined for macroscopic systems are invalid for finite-size systems. Isobaric expansion coefficient and isothermal compressibility for a finite-size ideal Fermi gas system
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