Introduction

Transfer of heat from one end (part) to another end (part) by molecular collisions (without movement of particles from their original position) is called conduction.

OR

Transfer of heat from the place of higher temperature to the place of lower temperature due to molecular vibration of particles about their mean position(without their actual motion) is called conduction.

Thermal Conductivity or Co-efficient of Thermal Conduction

The ability of a solid (material) to transfer or conduct heat is called thermal conductivity or co-efficient of thermal conduction

Formula for Thermal Conductivity (K) of a solid