# Thermal conductivity tables?

• heiroglif
In summary, the temperature column in a thermal conductivity table represents the temperature at which the given coefficient "K" is measured. Thermal conductivity is dependent on temperature and can vary significantly, so a linear extrapolation or a more comprehensive database may be needed to determine the thermal conductivity at other temperatures.
Hi heiroglif,
I think this post probably should go in the Materials & Chemical Engineering Forum. But to answer your question, thermal conductivity, like many material properties, is dependant on temperature. Properties can vary significantly depending on temperature. The web page you've pointed to is just giving you the thermal conductivity at a few different temperatures. You could use a linear extrapolation to determine the thermal conductivity between two temperatures, or just find a better database that gives you properties as a function of temperature.

The temperature column in a thermal conductivity table represents the temperature at which the given coefficient "K" was measured. The coefficient "K" is a measure of the material's ability to conduct heat, so the temperature column shows the value of "K" at different temperatures. This helps to understand how a material's thermal conductivity changes with temperature. It is important to note that the temperature column does not represent the heat capacity of the material, which is a measure of the material's ability to store heat. The thermal conductivity and heat capacity are related, but they are different properties. Therefore, it is important to use the correct units and understand the difference between them when using a thermal conductivity table.

## 1. What is thermal conductivity?

Thermal conductivity is the measure of a material's ability to conduct heat. It is the rate at which heat energy is transferred through a material, per unit area, per unit thickness, for a temperature difference of one degree.

## 2. What is the unit of measurement for thermal conductivity?

The unit of measurement for thermal conductivity is Watts per meter-Kelvin (W/mK). This unit represents the amount of heat energy (Watts) that is transferred through a material of a certain thickness (meters) for a temperature difference of one degree (Kelvin).

## 3. How is thermal conductivity measured?

Thermal conductivity is measured using a standardized method called the Hot Disk method. This method involves placing a small, heated disk between two surfaces of the material being tested and measuring the rate of temperature change over time. The thermal conductivity is then calculated using this data.

## 4. What factors affect the thermal conductivity of a material?

The thermal conductivity of a material can be affected by factors such as temperature, density, moisture content, and the presence of impurities. Generally, materials with higher densities and lower moisture content have higher thermal conductivity.

## 5. Why are thermal conductivity tables important?

Thermal conductivity tables provide a valuable resource for engineers and scientists to quickly and easily compare the thermal conductivity of different materials. These tables can help in the selection of materials for specific applications, and in the design of efficient heating and cooling systems.

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