Discussion
Borosilicate glass differs from soda lime glass chiefly in having
Answer: D
Correct answer: a much lower thermal expansion
Boric oxide substituted for much of the soda gives an expansion coefficient about a third that of soda lime glass, so a borosilicate article develops far smaller stresses when heated or cooled unevenly and resists thermal shock. That is why it is used for laboratory ware and for cookware. It is also less dense and has a *higher* softening temperature, not a lower one.
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