Azeotropic or azeotrope-like composition is disclosed. The azeotropic or azeotrope-like compositions, the E-1,1,1,4,4,5,5,5-octafluoro-2-pentene, methyl formate, n- pentane, 2-methylbutane, 1 , 1,1,3,3-pentafluorobutane, trans-1,2-dichloroethylene, 1,1,1,3,3-pentafluoropropane, dimethoxymethane, cyclopentane or Z-1,1,1,4 , a mixture of 4,4-hexafluoro-2-butene. Method for producing a thermoplastic or thermosetting foams by the use of such azeotropic or azeotrope-like composition as a blowing agent are also disclosed. How do the cooling caused by the use of such azeotropic or azeotrope-like composition as a propellant are also disclosed. How to use such azeotropic or azeotrope-like composition as a solvent is also disclosed. Method of manufacturing the aerosol product by using such azeotropic or azeotrope-like compositions are also disclosed. How to use such azeotropic or azeotrope-like composition as a heat transfer medium are also disclosed. Extinguishing or fire suppression method by using such azeotropic or azeotrope-like compositions are also disclosed. How to use such azeotropic or azeotrope-like composition as dielectrics are also disclosed. The method of separating a compound from a mixture of two or more compounds using such azeotropic or azeotrope-like compositions are also disclosed.