# Thermal conductivity

Thermal conductivity is often represented by the Greek letter "kappa", $\kappa$. The units of thermal conductivity are watts per meter-kelvin. Watts are a measure of power, meters are a measure of length, and kelvins are a measure of temperature. From the units, we can see that thermal conductivity is a measure of how much power (in watts) moves through a distance (in meters) due to a temperature difference (in kelvin).