Which method assesses the thermal properties of metals?

Thermal testing is a method specifically designed to assess the thermal properties of metals. This includes evaluating aspects such as thermal conductivity, thermal expansion, and specific heat capacity. Each of these properties provides critical information about how a metal will behave under varying temperature conditions, which is crucial for applications in engineering and materials science.

In contrast, the other methods listed focus on different material characteristics. For instance, the magnetic particle method is typically used for detecting surface and near-surface discontinuities in ferromagnetic materials. Eddy current testing is primarily utilized for detecting surface flaws and measuring thickness, particularly in conductive materials. Capillary action assessment is not related to thermal properties; instead, it involves the movement of liquids within the spaces of porous materials and is used for assessing fluid flow characteristics.

Thus, thermal testing distinctly focuses on the thermal responses of metals, making it the correct method for assessing their thermal properties.