温度・粘度
density
Japanese: 比重
Approximate weights of glass: About 2.5 for soda-lime glass and about 3.6 for lead crystal. / Note: The heavier the glass, the slower it conducts heat.
Approximate specific gravity of glass: about 2.5 for soda-lime glass and about 3.6 for lead crystal.
To put it simply, 1 cm³ of water weighs 1 g, while 1 cm³ of soda-lime glass weighs about 2.5 g.
Learn More
Specific gravity (density) is a measure of a glass's weight. It varies depending on the composition—approximately 2.5 for soda-lime glass and approximately 3.6 for lead crystal. The higher the proportion of heavy components, such as lead, the higher the specific gravity.
Glass with a high specific gravity generally conducts heat poorly, and thick pieces take a long time to heat up and cool down.
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.