Conduction - in form of Energy

We all have seen that the heat is energy transfer from one system to another.

The heat energy transfer occurs due to the temperature difference between the two systems.

And the temperature of the hot body decreases and the temperature of cold body increases.

For example, when we kept a cup of hot tea in the open air (room). Then, we noticed after some time, the cup of tea has got cooled.

Because, the cup of tea acts as a hot system and the air acts as a cold system.

So, there is a temperature difference due to which heat transfer takes place.

And the temperature of a cup of hot tea decreases and heat lost to the air.

Now, there are three modes of heat transfer. Conduction, Convection, and Radiation.

But, here we are interested to understand the conduction.

Let's discuss the conduction.

Conduction is the transfer of energy in the form of heat or electricity from one atom to another atom of the object.

It happens within an object by direct contact and without appreciable displacement of molecules.

The conduction mode of heat transfer takes place in all types of matter (solid, liquid and gas).

The solid transfers energy more efficiently than liquids and gases.

Because in the solids, the molecules are most tightly packed or closer together.

But in the case of liquids, the molecules are less tightly packed. So, it conducts less energy as compared to the solid.

And in the case of gases, the density of molecules is very less. So, it conducts very less energy as compared to solids and liquids.

The conduction happens due to the lattice vibration and movement of free electrons.

Let's see the example of conduction.

Suppose we are cooking in a frying pan.

Then, we noticed that the heat is conducted from the bottom end to throughout the frying pan.

Due to which we are able to cook the food.

The material which conducts the energy is called the Conductor.

For example, the material of the frying pan is the conductor.

Generally, the metals are the good conductor of heat. like, copper, silver, aluminum, etc.

The materials which do not conduct energy or very poor conductor of energy are called insulators.

Generally, the non-metals are the insulators. like, woods, plastics, etc.

Due to which, the handle of the frying pan is made up of wood or plastics.

And conduction does not take place in it. So, we can catch it easily.

Hence, the conductors and insulators both are important for our daily life.

Revision

Conduction is the transfer of energy in the form of heat or electricity from one atom to another atom of the object.

The solid transfers energy more efficiently than liquids and gases.

The material of the frying pan is the conductor.

And the handle of the material is the insulator. That's why We can catch it easily.

The End