# Thermal Conductivity

Written by Jerry Ratzlaff on . Posted in Thermodynamics

Thermal conductivity, abbreviated as k or $$\lambda$$ (Greek symbol lambda), is the ability to transfer heat within a material without any motion of the material.  Depending on the material, the transfer rate will vary.  The lower the conductivity, the slower the transfer.  The higher the conductivity, the faster the transfer.

### Thermal Conductivity formula

$$\large{ k = \frac{Q \; l}{A \; \Delta T} }$$

Where:

$$\large{ k }$$ or $$\large{ \lambda }$$   (Greek symbol lambda) = thermal conductivity

$$\large{ A }$$ = area of the object

$$\large{ l }$$ = length or thickness of material

$$\large{ Q }$$ = amount of heat transfer through a material

$$\large{ \Delta T }$$ = temperature differential