What is the relationship between thermal conductivity and the density, specific heat and thermal conductivity of the material?

The relationship between the thermal conductivity of the insulation material is λ=k/(ρ×c), where k represents the thermal conductivity of the material, ρ represents the density, and c represents the specific heat.

1. The concept of thermal conductivity
In insulation materials, thermal conductivity refers to the ability of heat per unit area in the material to pass through the material per unit time, that is, the heat transfer rate. It is usually expressed by the heat flow per unit area per unit time when the temperature difference is 1K, and the unit is W/(m·K). The magnitude of heat conduction depends on the thermal conductivity and temperature difference of the material.

2. The calculation formula of thermal conductivity
The thermal conductivity of the insulation material is related to the density, specific heat and thermal conductivity of the material, and the relationship between them is: λ=k/(ρ×c).
Among them, k represents the thermal conductivity of the material, the unit is W/(m·K); ρ represents the density, the unit is kg/m³; c represents the specific heat, the unit is J/(kg·K). This formula tells us that if we want to reduce the thermal conductivity of the insulation material, we need to reduce the density, specific heat capacity and thermal conductivity of the material.

3. Factors affecting thermal conductivity
The thermal conductivity of the insulation material is affected by many factors, such as temperature, structural properties of the material (such as crystal structure), chemical composition of the material, interaction of the material, etc. In addition, the density, water content, porosity and other parameters of the insulation material will also affect the thermal conductivity.