# Heat Penetration Calculator

Using the Heat Penetration Calculator, one can easily determine the distance at which heat from any heat source, like a thermal conductivity sensor, dissipates into a sample. Calculating the penetration of a heat signal from sensor, is key to understanding how much of your sample is included in your measured thermal conductivity result. For “true” thermal conductivity, heat penetration should be maximized.

To calculate how much time is required for heat to dissipate into your sample, enter your sample’s thermal diffusivity or select a similar material from our 1000+ material database.

## Penetration Depth

$D=k \sqrt{at}$

 a = Thermal Diffusivity: (mm 2/s) or t = Time: seconds Sample Thickness: mm D = Penetration Depth: mm % of Sample Penetration Depth: %

*Note: “k” (temperature recording sensitivity constant), may vary with choice of method.