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===Meaning===
[[Glass]] is a [[hardness|hard]], [[brittle]] and [[transparent]] [[solid]] (at [[Room Temperature|room temperature]]) made from [[Silicon Dioxide]].
===About Glass===
: [[Glass]] is made by [[melting]] [[sand]] and allowing it to [[Freezing|freeze]] into a new shape.
: [[Glass]] is used for windows because it is [[transparent]].
: [[Glass]] is brittle which means it doesn't not change shape easily and will break before bending.
: [[Glass]] is a [[solid]] but is unusual because the [[particle]]s are not in a regular order.
==Key Stage 4==
===Meaning===
[[Glass]] is a [[Giant Covalent Structure]] made from [[Silicon Dioxide]].
===About Glass===
: [[Glass]] is an [[Amorphous Solid|amorphous solid]] which has [[particle]]s in fixed positions, but not in a regular arrangement.
===Applications and Properties===
{| class="wikitable"
|-
| style="height:20px; width:200px; text-align:center;" |'''Application'''
| style="height:20px; width:200px; text-align:center;" |'''Properties'''
|-
| style="height:20px; width:200px; text-align:center;" |Windows
| style="height:20px; width:200px; text-align:center;" |Transparent - So light can pass through.
Hard - So it doesn't get scratched.
Strong - So it does not change shape under a [[force]].
|-
| style="height:20px; width:200px; text-align:center;" |Lenses
| style="height:20px; width:200px; text-align:center;" |Transparent - So light can pass through.
Hard - So it doesn't get scratched.
Strong - So it does not change shape under a [[force]].
Refractive Index of 1.3 - To [[refraction|refract]] light.
|-
| style="height:20px; width:200px; text-align:center;" |Light Bulbs
| style="height:20px; width:200px; text-align:center;" |Transparent - So light can pass through.
Hard - So it doesn't get scratched.
|}