Thermal conductivity of air - what is it?

Faced with such a concept as the thermal conductivity of the air, we begin to wonder - and what is it all about? This interchange of particles between bodies, that is, a body in which particles are more heated, transfer particles to the body in which they are less heated.

If we talk about the thermal conductivity in the air, then we must note the fact of the transfer of molecular particles in space, that is, there is a molecular movement Particles. Exchange can occur as with homogeneous bodies, and different in composition. Such heat exchange can occur in three states: gas, liquid, crystal (solid state).

The thermal conductivity of the air exists so that the temperature between the bodies is equalized by the recoil and the reception of heated particles. To do this, its exact calculation is necessary. The determination of the thermal conductivity is calculated according to the Fourier law according to a special formula. It is used in the construction of buildings, structures or any premises in which offices will be located or which can be used as a place to live.

Thermal conductivity of the air helps builders to select the right material, depending on the purpose of building operation. For premises that will be adapted for the place of residence, select materials that will keep the heat and not pass cold air currents.

The most good conductors of warm energy are various types of gases. The poorest conductors are all the common metals, because for their heating and for the beginning of the movement of particles, a high temperature is needed, which under normal conditions can not be achieved. The exchange of particles between bodies can be observed when we cook on a stove or on a fire.

Opening the gas in the stove, we set it on fire, thereby releasing the heat directed towards the dishes, after which the particles of the material from which the dishes are made begin to give their heat to the substance inside the dishes and it heats up. This method of energy transfer explains the thermal conductivity of air.

Thermal conductivity is very dependent on the structure of matter. The more porous, the less conductivity. There is such a term as a change in thermal conductivity. It refers to those substances that can pass from one state to another, for example, ice and water.

At present, the measurement of the thermal conductivity of a substance is carried out with the help of special instruments, which allow us to investigate the thermal conductivity with a heated surface of the material being measured from 30 to 750 degrees.

Such devices are most often made of an electric heating element, low-inertia heat meters, on which thermocouples are located, and the structure itself is located in a metal casing, which is filled with heat-insulating material. The heating element, heat meters and refrigerator are made in disk form.

Knowing the thermal conductivity of the air, you can equip your house or apartment so that they are warm, and also be able to advise your relatives about the material they need, for example, for upholstering a wall in a private house so that it is comfortable, cozy and peaceful.

For building purposes it is possible to use foam sheets of small thickness for wall sheathing, since they keep the heat well. In villages, houses are built of wood, because the tree also holds heat for a long time, in contrast to concrete.