Question

On what factors of solid substance it's thermal conductivity depends on and how?
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Answer 1

» Thermal Conductivity :

Thermal conductivity is the measure of ability to conduct some amount of heat. Generally, heat is transmitted by conduction.

SI unit : Watts per meter-kelvin. [W/mK]

Dimension : $\sf \: M {}^{1} L {}^{1} T {}^{ - 3} \theta { }^{ - 1}$

Considering the dimensions, M is mass, L is length, T is time, θ is required temperate.

Thermal Conductivity depends upon :

Basically, thermal conductivity depends on 4 factors. They're :

» Material :

This is the 1st factor which affects the thermal conductivity of an substance. Mainly, the kind of material is being used in thermal conductivity of any substance can affect the rate of energy of movement.

Also, greater the conductivity of the material, faster is the movement of energy.

» Temperature Difference :

Thermal conductivity also depends upon the temperature difference as it [thermal conductivity] may vary with respect to it.

If there is any rise in temperature difference, accordingly the thermal conductivity will increase as well. And as a result the amount of flow of energy will be increased.

» Length of the material :

Length of the material affects the thermal conductivity as if the length of the material is shorter, faster the energy will flow through it.

If the length of material is increased, the same way thermal conductivity flow will be increased.

» Area of Cross Section :

Mainly, area of cross-section are either round shaped, hollow or C shaped.

The rate of thermal conductivity of material is proportional to the cross-sectional area.

As the area of cross-section will be increased, thermal conductivity of the material will also be increased and vice versa.

Answer 2

Answer:

✄Thermal conductivity

depends On following factors✨

Temperature✨

• The effect of temperature on thermal conductivity is different for metals and nonmetals.

• In metals, heat conductivity is primarily due to free electrons.

• In alloys the change in electrical conductivity is usually smaller and thus thermal conductivity increases with temperature, often proportionally to temperature.

Density✨

• An increase in the bulk density will decrease the “heat transfer average distance, and therefore decrease the thermal conductivity. Counteracting this effect is the increased mass within the same volume, which will increase the solid conduction.

Moisture content of the material. ✨

• Thermal conductivity depends strongly on moisture, temperature and structure of the material. In porous materials the void fraction and the pore structure and distribution affect thermal conductivity significantly.

Hope it helps you ✨（＾ｖ＾）