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Wednesday, March 25, 2009

Colorful sun...!!!

Why when sunrise and sunset the sky looks so colorful?

~> when the position of the sun is low rise, or sink, we looked through the most thick atmosphere. When have to hitch that thickness, most of the blue light that come to our direction mixed to every directions, so that light to our eyes doesn't have blue element. The lack of blue element at sun light appear to be red, orange, or yellow, depending on the size of the particles of dust that hang in the air, as well as colors that mixed by dust particles.

The sky blue ...!!!

why the sky is blue???

~>first, you need to know that light with shorter wave (in the light spectrum) is in the blue region, with the spread angle greater than the direction of the longer wave, because this size is approaching the size of smoke particles.

then when we look to the sky, we see a light blue is mixed by air from every directions. Thus, the sky appears blue even though there are additional light from the sun.

Monday, March 23, 2009

Soap...!!!

How do people make soap? ...

~> The completely dirty situation that found when making a soap is against the use of it as a cleaner, and soap already made at least two thousand years ago.

♣These are the stages to make soap :
limestone heated to produce lime. the wet lime put to the top of the wood that is still hot and then stirred up the average. Then the resulting gray mush entered into a vessel containing hot water and boiled with some additional pieces of sheep fat for several hours. When the layer is dirty brown colored foam that form in the thick surface, and becomes hard after a cold, then the hard layer is cut, that's our soap...

Fire...!!!

The flame on a gas stove is blue, but the flame on candles on is yellow. What causes the flame have a different color? ...

~>This is a problem concerning how much oxygen is available to ignite the fuel. a lot of Oxygen causes blue flames, while the limited oxygen causes yellow flames ...

Another mystery in the process of cooking...!!!

the longer you boil the eggs, the egg is getting harder. Conversely, the longer you boil potatoes, the potato is getting sofer. Why so different from the influence of heat on the different types of food?...

~> because cooking makes protein harden, while carbohydrate softer (except meat -> depends on the structure of animal muscle)...

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