Thermal Conduction
The transfer of thermal energy through a stationary medium via microscopic particle collisions and free electron movement without bulk fluid movement.
Governing formula
q = -k A (dT/dx) (Fourier's Law)
SI unit
W/m² (k in W/(m·K))
In depth
Proportional to temperature gradient ($dT/dx$) and material thermal conductivity $k$. Metals exhibit high thermal conductivity due to free conduction electrons.
Examples in the real world
Heat traveling along a metal spoon handle when resting in a cup of hot soup.