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温度・粘度
surface tension
Japanese: 表面張力
The force exerted by molten glass to round the edges and tighten the surface. This is the cause of shrinkage in a single sheet.
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Surface tension is the force that causes molten glass to round its edges and contract its surface in an effort to minimize its surface area.
When a single sheet of glass is melted at high temperatures, its edges become rounded and the entire piece shrinks and becomes thicker due to this force. Surface tension is also responsible for the smooth edges produced by full fusing.
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.