Scientific Explanation of Common Phenomena

1. It is dangerous to sleep in an unventilated room with fire burning inside because the fire produces carbon monoxide and carbon dioxide gases. Carbon monoxide is poisonous and can cause death. 2. The filament of an electric bulb is made of tungsten because it has a high melting point and can be heated to a high temperature to emit light. 3. Water kept in an earthen pitcher becomes cold because the pitcher has minute pores on its surface which absorb water. Water in the pores evaporates when it comes in contact with air, and produces a cooling effect. 4. A sliced apple, when exposed to air, turns brown after some time as it contains iron which gets oxidised and gives the fruit a brownish colour. 5. The freezing compartment inside a refrigerator is at the top because the air in contact with...

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How Fingerprint Scanners Work ?

Introduction to How Fingerprint Scanners Work Computerized fingerprint scanners have been a mainstay of spy thrillers for decades, but up until recently, they were pretty exotic technology in the real world. In the past few years, however, scanners have started popping up all over the place -- in police stations, high-security buildings and even on PC keyboards. You can pick up a personal USB fingerprint scanner for less than $100, and just like that, your computer's guarded by high-tech biometrics. Instead of, or in addition to, a password, you need your distinctive print to gain access. In this article, we'll examine the secrets behind...

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LCD TV-The Good And The Bad

The Good about LCD TVAn LCD TV is very thin and light and therefore great to save space. Anyone who has an LCD monitor for their desktop computer will relate. Remember the large chunky one ones we used to all have? That is what a standard television set is like now. Along with great picture quality there is almost not static image burn-in problems because the fluorescent backlight is filtered by the liquid crystal in solid state.The TV lasts a life time or for as long as 50,000 to 80,000 hours claimed by manufacturers. This outshines the plasma whose life expectancy is much less. These TVs will last as long as the backlight can produce white...

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