Sunday, April 29, 2007

Is Glass 'liquid'?


Why I am asking this?? Well it’s not my fault, actually scientist are debating on this issue for decades. Some schools say that it is ‘solid’, while there is another significant large group, which says that it is ‘liquid’!

As far as it is concerned with ‘solid’ theory, we all can say that glass is solid, because it appears to be solid at room temperature. Let’s focus on the arguments and facts, what is said in favor of liquid theory. They say glass is never ‘solid’; rather it is ‘undercooled’ liquid! In solids such as iron, steel, and aluminum, the atoms are arranged very orderly, in a repeating pattern, like tiles on a bathroom wall. Because of the random atomic structure of glass, physicists tent to think of glass as a liquid which is supercooled. Metals and other materials, say ice are solid up to their melting point, where they suddenly turn into liquid. But glass is different. When you heat glass, there is never a sudden transition from solid to liquid. Rather, glass becomes gradually more deformable.

But if glass tends to have properties of ‘liquid’, then at least it should evince some of them?? Well, they claim, they can be seen, but we need to change the circumstances a bit to visualize the liquid properties of glass. Say, if glass is really liquid, then it should ‘flow’ like a liquid? The answer is, it really DOES flow! For example, if a window glass is kept vertical for a long time say for years, and we have sensitive measuring instruments, then we can really measure that the thickness of glass at the bottom is more than the top.

Some schools, who don’t believe in this theory, say that though glass molecules are not arranged in perfect order, but they can precipitate into crystals anytime if given a favorable condition say low temperature and pressure. It also depends on the facts that how rapidly a glass is cooled after it is heated. If a glass is cooled very slowly, then it will tend to form a crystal, and not a supercooled solid. They give many other arguments in support of its solid property with order of transition, viscosity and poises.

Whatever, but it is for sure, that none of the theories are 100% evident. So there is a fare good chance, that glass is actually a ‘liquid’!

Saturday, April 28, 2007

Honesty.

All men profess honesty as long as they can. To believe all men honest would be folly. To believe none so is something worse.




*John Quincy Adams

Friday, April 27, 2007

RSS problem


Doesn't matter, whatever I try, this Blogger RSS feed, and Yahoo.360 seems to be envious sisters! They simply don't want to talk to each other.
Lately I have updated a blog in Blogger. I knew it takes some time to update that blog in Yahoo.360 page, but despite I waited for 2 days, it was not updated. Ultimately I had to reconfigure my url address in Feed setup at Yahoo.360 page.
There is one more problem with Yahoo.360, they don't seem to have any clock!.......lol.......Yeah, whatever feed is updated in Yahoo.360 page, it comes with an arbitrarily chosen date. For example, I started creating blogs in Blogger for last 2 weeks, but they show the updating date as January!
This problem persist for some other sections as well. The comments that we post in Yahoo.360, even they are showing arbitrarily chosen dates.

Wednesday, April 25, 2007

Lucid Dreams!


Lucid dreaming is the state of being aware that you are dreaming. This allows you to take charge and control your dreams in productive ways. Lucid dreaming can be used as a tool for problem solving and personal growth. Lucid dreamers (sometimes called "oneironauts") regularly describe their dreams as being exciting, uplifting and highly rewarding.

Humans spend about a third of their lives asleep. Some lucid dreamers argue that sleeping through dreams is not a productive use of one's lifespan. With consistent practice, people can learn to become lucid pretty much whenever they want and recapture some of this lost time. Lucid dreaming is not easy; it requires a lot of practice and training.

Thursday, April 19, 2007

What to speak?

For humans, it takes 2 years to learn 'how' to speak, yet the whole life may fall short to learn 'what' to speak!

Wednesday, April 18, 2007

I have done few modifications in my RSS


I have done few modifications in my RSS. Now lets see is it configured with Yahoo.360 or not properly??

Monday, April 16, 2007

Thank you

Hello,
This is my first day I am trying to blog. I don't know what and how to write in this. So I am starting here with this one line.
Thank you.