Uzi maalum wa kupeana Likes: Comment chochote upate "Like"

Uzi maalum wa kupeana Likes: Comment chochote upate "Like"

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773. What is an amorphous solid?

An amorphous solid does not have a definite geometric or crystalline shape. It is a solid in which there is no long-term order in the positions of the atoms. Most classes of solid materials can be found or prepared in an amorphous form. For instance, common window glass is an amorphous ceramic, many polymers are amorphous, and even foods such as cotton candy are amorphous solids.
An amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel.
Solids and liquids are both forms of condensed matter; both are composed of atoms in close proximity to each other. But their properties are, of course, enormously different. While a solid material has both a well-defined volume and a well-defined shape, a liquid has a well-defined volume but a shape that depends on the shape of the container. Stated differently, a solid exhibits resistance to shear stress while a liquid does not. Externally applied forces can twist or bend or distort a solid’s shape, but (provided the forces have not exceeded the solid’s elastic limit) it “springs back” to its original shape when the forces are removed. A liquid flows under the action of an external force; it does not hold its shape. These macroscopic characteristics constitute the essential distinctions: a liquid flows, lacks a definite shape (though its volume is definite), and cannot withstand a shear stress; a solid does not flow, has a definite shape, and exhibits elastic stiffness against shear stress.
 
774. What's the story behind Twitter bird logo?

In 2010 Twitter decided that it needed a new logo. They wanted something that perfectly symbolized the tweets that were the cornerstone of the business so they invented the twitter bird. The twitter bird summed up the objectives of the company perfectly. Not only did “tweets” sound like something a bird would do, but his quick and speedy look symbolized the quick and simple messages that the service offered.
Twitter's Logo name is Larry bird.
 
775. How Does Anesthesia Work?

Local anesthetics block the nerves that connect a particular body part or region to the brain, preventing the nerves from carrying pain signals to your brain. This renders patients unconscious with no perception or memory of the surgery (though pain from the surgical procedure will be apparent once you wake up).
 
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