Question

what is thermal conductivity

Answer 1

The degree to which a specified material conduct eletricity,calculated as the ratio of the current density in the material to the electric field which causes the flow of current.

Answer 2

Answer:

What is Thermal conductivity?

⇒ Thermal conductivity is the amount of heat that is transferred over certain duration of time due to a temperature difference.

⇒ Experimentally observation show that amount of heat transfer is directly proportional to temperature difference (ΔT), area of face A and the time at which heat is flow and inversely proportional to distance between two faces.

$\implies \sf Q \propto \dfrac{\Delta T\;A\;t}{\Delta x}$

Where,

• ΔT = Temperature difference (T₁ - T₂)
• Δx = Distance between two faces.
• t = Time at which heat flow.
• Q = Amount of heat
• A = Area

$\implies \sf Q \propto \dfrac{\Delta T\;A\;t}{\Delta x}\\ \\ \\ \implies \sf Q = k\Bigg(\dfrac{\Delta T}{\Delta x}\Bigg)At\\ \\ \\ \sf Where,\;k=Coeff.\;of\;thermal\;conductivity.$

⇒ Unit of k = JS⁻¹m⁻¹k⁻¹

⇒ Dimension = [M¹L¹T⁻³K⁻¹]