why Glass is transparent?

Glass is produced out of sand which is not transparent so why glass is transparent?

  1. Sunburst
    on November 30th, -0001

    My guess would be that sand is nothing more than silica that has a regularity to its crystal structure, thus being opaque. Glass, being an amorphous solid (a really really viscous liquid essentially) doesn’t have a well definied crystallinity to it making it transparent. At least, that’s my guess.

  2. CrispApple
    on November 30th, -0001

    The crystal structure of glass allows light to pass through while sand does not

  3. Retrogamer
    on November 30th, -0001

    the molecules line up in rows allowing light to pass through
    think of looking through a line of straws from the ends

  4. StraightToThePoint
    on November 30th, -0001

    so we can c through

  5. WhoLeOw
    on November 30th, -0001

    Not all sand is suitable for making optical glass. You’ve probably noticed some sand is dark red or brown, while other sands can be white or black. The colors come from metal impurities in the sand, and those can be removed by various means.

    The other reason you can’t see through sand is the same reason that you wouldn’t be able to see through glass if you stuck it in a blender. Optical clarity relies on both a lack of color and a low level of diffusion of light. Sand lacks both; glass dust, though colorless, would diffuse too much light.

    By the way, most glass is only transparent for a few inches before defects and color become apparent. You ever try looking long-ways through a piece of glass?

  6. Pulsar
    on November 30th, -0001

    silica is present in sand, when ignited with intense heat, it will produce clear transparent, addition of boron and CaO will also improve your glass.

  7. Paperclip
    on November 30th, -0001

    Glass has the same structure as diamond, only with the carbon replaced by silicon and oxygen. Whilst glass is quite pure, sand contains lots of mineral impurities which give us the various colours of sand.

  8. Iceblast
    on November 30th, -0001

    every idiot knows that sand is a solid but when it is heated to the correct temp it is turned into a liquid called glass and glass IS a liquid that never settles it just gets more brittle with age

  9. Fairground
    on November 30th, -0001

    Glass is a fused mass of silica sand, limestone, soda ash and sometimes dolomite. Why it is colourless is due to the crystalline structure of the fused mass which is a calcium silicate, with other silicate masses present such as magnesium from the dolomite. The main problem with colourless glass is its impurities which can discolour the final fused mass. iron for example is analysed by the glass manufacturer in all of its ingredients so that the final iron content is exact. Too much iron and the colour of the glass will go green, look at the edge of glass and you can see green iron staining. Coloured bottles contain deliberate colourants to produce this discolouration.

  10. SandyPrints
    on November 30th, -0001

    Try this site for an explanation. http://science.howstuffworks.com/question404.htm

  11. Clockwork
    on November 30th, -0001

    Glass is a liquid, its always moving, slowly. Not sure why its clear though lol.

  12. Barbwire
    on November 30th, -0001

    hi,
    ok glass is made from sand and how come it is transparent. see when a man comes to world he is in blood and then nurse in the hospital make him smart and then when he grows up he becomes a famous personality.. in this way a lot of refining process take to convert sand into glass and in the same way a small child becomes a transparent person with ethic values. its the way u mould sand or child everything becomes transparent provided u give him the right process of making the things.
    bye
    gogivakil@yahoo.co.in

  13. Mitch
    on November 30th, -0001

    Let me take you through the stages of making glass!

    1- The sand is melted to a liquid (this is why it is transparent-because its liquid!)

    2-The melted sand is then stretched to form a window!

    Its quite simple really! Hope this heps 🙂

  14. SlightlyBitter
    on November 30th, -0001

    glass is transparent because electrons in glass are confined to particular energy levels,that cannot absorb or re-emit photons….the photons of light travel through glass instead of being absorbed and reflected Also the molecular units of glass are so small in comparison to the wave lengths of ordinary light that their absorption effect is negligible.

  15. WellBalanced
    on November 30th, -0001

    erm……….what they said.

  16. Hunter
    on November 30th, -0001

    You seem to think that sand is not transparent. It is.

    If you pick up a single grain of (white) sand, you will see that light shines through it. Its colour (caused by minerals trapped inside) diffuses the light, so that most sand is ‘translucent’ rather than ‘clear’, or perfectly transparent.

    You also seem to think that glass is transparent. It isn’t.

    If you break or crush sheet glass, you will find that the smaller the pieces, the less transparent it seems. If the pieces are as small as grains of sand, it will be just as difficult to see through them. Sheets of glass are only clearly transparent because of their parallel surfaces. Even slightly distorted surfaces will start to destroy the clarity of the image you see through the sheet.

    The surface of a glass sheet is often treated (to make ‘privacy’ glass, for example) with acid. This etches the surface unevenly, and completely disrupts the transmission of light. The sheet becomes translucent.

    Coloured glass blocks light other than the colour you see. Breaking or etching coloured glass produces an even less transparent result than you get with clear glass.

    A lot of ‘natural’ (volcanically fused) glass, such as Obsidian, is very deeply coloured, so that it appears opaque. Sand is often deeply coloured (yellow, brown and even black sands are very common), because it was made from opaque materials.

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Why Glass is transparent?

Glass is produced out of sand which is not transparent so why glass is transparent?

  1. Stare
    on November 30th, -0001

    The atomic bonds between Silicon, Oxygen, Calcium, Sodium, Lead, etc, are predominantly covalent, which allows the light to travel through it.

    If there were free electrons, the light would be reflected.

  2. Salinger
    on November 30th, -0001

    Brilliant question. You obviously know how glass is made and the chemical composition so it doesn’t make sense does it. I suppose, in this instance, its one of those questions that has no real answer – it just is!

  3. DownUnder
    on November 30th, -0001

    Ice is made out of water and is not anywhere near as transparent. Your LCD screen sometimes is transparent and sometimes isn’t. This is because some molecules let light through depending on their orientation.
    Actually, glass is transparent for certain frequency spectrum only.

  4. SpeedDemon
    on November 30th, -0001

    The answer to your question is more straightforward than those posted above: Substances are not transparent if they absorb light. They absorb light, at specific frequencies, because the atoms and molecules within the substances has certain energy-level transitions corresponding to these frequencies. This is not accidental: these can be calculated from quantum-mechanical computations.

    In the case of your question about glass vs. sand, according to the reference: “Silica glass may be produced by using sand as a raw material (or “quartz sand”) that contains almost 100 % crystalline silica in the form of quartz. Although it is almost pure quartz, it may still contain a small amount (less than 1 %) of iron oxides that would color the glass, so this sand is usually depleted before production to reduce the iron oxide amount to less than 0.05 %.”

    What this indicates is that it is the IRON OXIDES in sand that are absorbing the light; and when they are reduced to below 0.05% (by weight or by number? It doesn’t say), the remaining substance will be substantially non-absorbing; it still needs to be melted to avoid the distortions of gnarled shapes, of course.

  5. Gilbert
    on November 30th, -0001

    Nearly all crystal is clear and refined pure, hence the clearness, diamond is crystallized carbon, or coal.

  6. FeralFeline
    on November 30th, -0001

    The molecular structure of glass permits wavelengths of visible light to weave through.

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