Relative Permittivities of 1,1,1,2,3,3,3-Heptafluoropropane (HFC-227ea), 1,1,1,2,3,3-Hexafluoropropane (HFC-236ea), and 1,1,1,3,3-Pentafluorobutane (HFC-365mfc) in the Liquid Phase Ribeiro, A.P.C.; Nieto de Castro, C.A.; Pai-Panandiker, R.S.; Mardolcar, U.V.; Journal of Chemical & Engineering Data 2007, 52, 2041-2049