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We use '''glass''' to make windows because it is transparent.
We also use '''glass''' to make drinking glasses because it is hard, firm and waterproof.
==Key Stage 2==
===Meaning===
[[Glass]] is a hard, [[brittle]] and [[transparent]] [[solid]] [[material]] made form [[Melting|melted]] sand.
==Key Stage 3==
===Meaning===
[[Glass]] is a [[hardness|hard]], [[brittle]] and [[transparent]] [[solid]] (at [[Room Temperature|room temperature]]) made from [[Silicon Dioxide]].