Question

Explain the conduction mode of heat transfer.

Answer 1

Hint:Thermal conduction is the transmission of internal energy within a body through tiny particle collisions and electron mobility. Molecules, atoms, and electrons collide and transmit chaotic tiny kinetic and potential energy, collectively known as internal energy. Conduction occurs in all three phases of matter: solid, liquid, and gas.

Complete answer:
Heat moves from a hotter to a cooler body on its own. For example, heat is transferred from an electric stove's hotplate to the bottom of a saucepan that is in contact with it. Temperature disparities inside a body or between bodies fade with time in the absence of an opposing external driving energy source, and thermal equilibrium is approached, with temperature becoming more uniform.

Heat is transferred from the hottest to the coldest surface by conduction, which occurs at the molecular level without any apparent movement of molecules. The molecules pump into their neighbours and transmit energy to them throughout the heat transfer process, which continues as long as heat is being supplied. The flow of energy between bodies continues while the temperature difference between them decays, resulting in a condition known as thermal equilibrium.

The greater the value of a body's thermal conductivity K, the better it conducts heat. The value of K for an insulator is zero. The movement of heat through matter (solids, liquids, or gases) without bulk motion is known as conduction heat transfer. The collisions and diffusion of molecules during their random motion cause conduction heat transfer in gases and liquids.

Note: The study of heat transmission between solid bodies in contact is known as thermal contact conductance. At the interface between the two surfaces in contact, a temperature decrease is frequently seen. The presence of a thermal contact resistance between the contacting surfaces is considered to be the cause of this phenomena. The resistance of an interface to heat flow is measured as interfacial thermal resistance. Thermal resistance, unlike contact resistance, persists even at atomically perfect surfaces.