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温度・粘度
thermal diffusivity
Japanese: 熱拡散率
The rate at which temperature changes are transmitted. Plaster molds and powders have low thermal conductivity and require prolonged holding.
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Thermal diffusivity is a quantity that describes how quickly a temperature change propagates through a material; it is calculated by dividing the thermal conductivity by the product of density and specific heat.
Plaster molds and powders have low thermal diffusivity, so it takes time for heat to reach the interior. This is why thick castings require a long holding time.
This entry is written in Japanese by Rei Chikaoka and translated for readers outside Japan. If something reads oddly, the original is the source of truth.