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温度・粘度
thermal conductivity
Japanese: 熱伝導率
Thermal conductivity. Glass has low thermal conductivity, and the thicker the piece, the slower the center heats up or cools down.
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Thermal conductivity is a measure of how easily heat is transferred. Glass has a lower thermal conductivity than metals, and the thicker the glass, the slower the center heats up or cools down compared to the surface.
Since a large temperature difference between the inside and outside can cause thermal shock cracking, thicker materials require a slower rate of heating and cooling.
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.