. . "http://en.wikipedia.org/wiki/Thermal_conductivity"^^ . . . . . . . . . . "Phonon Mean Free Path"@en . . . . . . . . . . . . . . . . "l_{ph}" . . . . "http://www.iso.org/iso/catalogue_detail?csnumber=31897"^^ . . . . . "\"Phonon Mean Free Path\" is the mean free path of phonons." . . . . . . . .