thermal conductivity

Japanese: thermal conductivity（英語表記）thermalconductivity

…When both sides of a plate of uniform thickness d are kept at temperatures T ₁ and T ₂ (＞ T ₁ ), the amount of heat I flowing through a unit area of the plate per unit time is given by I = κ( T ₁ - T ₂ )/ d , since the temperature gradient inside the plate is ( T ₁ - T ₂ )/ d . This proportionality coefficient κ is thermal conductivity, which indicates how easily heat is transmitted (i.e., the larger κ, the easier it is to transmit heat). Since heat is energy, the unit of κ is W/K･m, or cal/℃･s･m. …

*Some terminology explanations that mention "thermal conductivity" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…厚さdの一様な板の両面を温度T₁,T₂(＞T₁)に保ったとき，単位時間に板の単位面積を通して流れる熱量Iは，板の中の温度こう配が(T₁－T₂)/dであるから，　I＝κ(T₁－T₂)/dで与えられる。この比例係数κが熱伝導率thermal conductivity(熱伝導度ともいう)であり，熱の伝わりやすさを表す(すなわちκが大きいほど熱が伝わりやすい)。熱はエネルギーであるから，κの単位はW/K･m，あるいはcal/℃･s･mである。…