- published: 14 Feb 2012
- views: 4031991
Glass is an amorphous (non-crystalline) solid material. Glasses are typically brittle and optically transparent.
The most familiar type of glass, used for centuries in windows and drinking vessels, is soda-lime glass, composed of about 75% silica (SiO2) plus Na2O, CaO, and several minor additives. Often, the term glass is used in a restricted sense to refer to this specific use.
In science, however, the term glass is usually defined in a much wider sense, including every solid that possesses a non-crystalline (i.e., amorphous) structure and that exhibits a glass transition when heated towards the liquid state. In this wider sense, glasses can be made of quite different classes of materials: metallic alloys, ionic melts, aqueous solutions, molecular liquids, and polymers. For many applications (bottles, eyewear) polymer glasses (acrylic glass, polycarbonate, polyethylene terephthalate) are a lighter alternative to traditional silica glasses.
Silica (the chemical compound SiO2) is a common fundamental constituent of glass. In nature, vitrification of quartz occurs when lightning strikes sand, forming hollow, branching rootlike structures called fulgurite.
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Sitting in a graveyard
Waiting for the dawn
Leaning on my tombstone
Till the night is gone
Oh how the moon
Hangs in black sky
Wish i could find out
The reason why
I sit here alone
And cry
My woman was so lovely
Together we were one
No sunshine in my weary eyes
Now that she has gone
Oh how the moon
Hangs in black sky
Wish I could find out
The reason why
I sit here alone
And cry
Palm trees whisper to me
From your spreading height
Tell me all the loney stories
Of the world at night
Oh how the moon
Hangs in black sky
Wish I could find out
The reason why
I sit here alone