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温度・粘度
Young's modulus
Japanese: ヤング率
The resistance of glass to deformation (hardness). Lead-based glass has a lower hardness but is somewhat resistant to thermal shock.
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Young's modulus is a measure of a material's resistance to deformation (elastic stiffness). The higher the value, the less likely the material is to deform under force.
Lead-based glass has a relatively low Young's modulus and tends to be somewhat resistant to thermal shock. This also affects its susceptibility to cracking due to residual stress.
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.