\θˈɜːmə͡l kɒndəktˈɪvɪti], \θˈɜːməl kɒndəktˈɪvɪti], \θ_ˈɜː_m_əl k_ɒ_n_d_ə_k_t_ˈɪ_v_ɪ_t_i]\
Definitions of THERMAL CONDUCTIVITY
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The quantity of heat which passes in a unit of time through a unit of area of a wall of a given substance; the wall being a unit thick, and its opposite sides having temperatures which differ by a unit. As thus defined, the T. C. of silver is about four times that of brass, and ten times that of iron.
By Henry Percy Smith