How can we see through glass?
Glass is a transperant object which is an amorphous(non-crystalline) solid. The primary constituent of glass is sand(silicon dioxide,SiO2).The atoms in a solid are tightly bound to each other.The molecules are held together with strong intermoleculer force.Therefore the molecules can not move freely and the space between them is very little.So,they do not allow light to pass through them.Light can pass through liquids and gases because the molecules of liquids and gases can move freely and a lot of space between them.Glass is manufactured by melting sand at a very high temperature and then cooling it.Therefore brittle substance is produced but glass still contains the free moving molecules of a liquid.So,light can pass through the free space between the molecules although glass itself is a solid.
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