Friday, May 6, 2011
Sunday, May 1, 2011
The Slow Motion - Droplet Collisions at 5000fps
Check out this video on YouTube:
http://www.youtube.com/watch?v=cNI-LIVs-to&feature=youtube_gdata_player
Exclusively sent from my iPad
Wednesday, April 20, 2011
Sunday, March 20, 2011
Monday, March 7, 2011
Thursday, February 3, 2011
Short History on Glass
Glass occurs naturally when rocks high in silicates melt at high temperatures and cool before they can form a crystalline structure. Obsidian or volcanic glass is a well known example of naturally occurring glass, although it can also be formed by a lightning strike on a beach, which contains silicate-rich sand.
Early forms of glass were probably rife with impurities and subject to cracking and other instability, but examples of glass beads, jars, and eating materials first appeared in ancient Egyptian culture.
When manufactured by humans, glass is a mixture of silica, soda, and lime. Other materials are sometimes added to the mixture to “frost” or cloud the glass or to add color. The elements of glass are heated to 1800° Fahrenheit (982° Celsius).
The resulting fused liquid can be poured into molds or blown into various shapes, and when cooled, glass is a strong, minimally conducting substance that will not interact with materials stored inside. As a result, glass is frequently used in scientific laboratories to minimize inadvertent chemical reactions and to insulate power lines.
What do we understand by Glass?
All we know is that it is a transparent , hard and brittle solid, used for many bottles or windows.
Do not worry, sugar glass doesn't contain any glass element !
If you’ve ever seen the film Terminator 2 where a actor is thrown through a window - and you’ve wondered “how did they do that?”, Well just sugar and more sugar.
The optical and physical properties of glass make it suitable for construction applications such as flat glass for windows, thermal insulators (glass wool which fills up the space between two walls ) internal glazed partitions, etc
A wide variety of colours may be obtained by addition of dispersed particles, such as soda-lime glass for a colourless glass or iron(II) oxide (FeO) which produce a green shade. To obtain float glass, a combination of metallic oxide ( for colour ), sand and alkali is required.
Source from http://www.petervaldivia.com/technology/materials/construction-materials.php
Is Glass Solid or Liquid?
Glass is an amorphous solid that has been around in various forms for thousands of years and has been manufactured for human use since 12,000 BCE.
The status of glass as a liquid, versus a solid, has been hotly debated. The short story is that glass is a supercooled liquid, meaning that it is rigid and static but does not change molecularly between melting and solidification into a desired shape.
Glass is one the most versatile substances on Earth, used in many applications and in a wide variety of forms, from plain clear glass to tempered and tinted varieties, and so forth.
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