Before going through this article we apologize to you if you find too many technical jargon. Those are only used as reference to explain science in everyday life clearly. Its not intended??that??you remember the technical jargon.
At least now after reading the article, you will know the truth and truth will set you free.
Science in everyday life ??? 1] Why palms and soles of our hands and feet are white?
Melanin is the chemical responsible for the darkness of our skin. It is produced in specialized cells known as melanocytes. There are 3 types of melanin namely eumelanin, pheomelanin and neuromelanin.
Eumelanin is the most common type. Pheomelanin is generally found in red hair. Finally, neuromelanin is??concentrated in brain. ??The major function of melanin is to protect our skin from UV rays of the Sun. These radiations are very??harmful and are well known for their cancer causing capability. Melanin can absorb and dissipate this??radiation efficiently. The more you will be exposed to UV rays of the sun, the more melanin will be??synthesized for the protection of your skin and the more darker your skin will become.Generally tropical countrymen are dark
This is the reason??why majority of people in the tropical countries are of darker complexion. This is because,??intensity of the sunbeams in the tropical countries??is the maximum.??Frequently used part of our body such as palms and soles of our feet contains an extra layer of dead skin??cells called stratum lucidum.??This acts to protect the palms and soles of our feet.??This extra protection means??that there is no need of melanin to protect those area. So these areas does not contain melanin??producing cells and hence are white in color.
Science in everyday life ??? 2] Why smoke emitted of motorcycles sometimes appear blue in color?
Two wheeler engines, such as motorbikes and scooters, are often two-stroke engines. Unlike four stroke engines (used in bus, trucks and motor cars), two-stroke engines??emit finer particles in terms of the particle diameter as smoke and form a colloidal mixture. They can stay suspended in air for a long time and can scatter visible blue light. The nature of scattering light is somewhat similar to Rayleigh scattering.??And we already know that??blue light is scattered??more than red or orange, as the frequency of blue light is higher.??That???s the reason why these smokes seemed to be blue in??color.
This type of scattering is called as tyndall scattering named after the irish physicist John Tyndall.??Tyndall scattering or tyndall effect is the scattering of light by colloidal mixtures or fine suspensions??containing particles of diameter roughly comparable to the wavelength of visible light (400-750 nm).
To Be Continued???