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Phosphorous : The bringer of Light

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Man invented fire ages ago and till date, fire is an indispensable aspect of our everyday life. Right from cooking to light, we use fire directly or indirectly. We use matchsticks for lighting the lamp and also for many other things. The matchsticks have phosphorus and let us now find out more about phosphorus....  Phosphorus: The Bringer of Light Ever since man discovered fire, it has been an indispensable aspect of our everyday life. Wondering what phosphorus has to do with fire? Keep reading... Let there be Light (Phosphorus) Phosphorus has the ability to ignite readily and hence is used as the main constituent in the heads of matches. It smoulders in air, and when it is warmed, it bursts into flames thereby producing thick, acidic smoke. In the late 17th century, a German alchemist named Hennig Brandt heated the solid residue that was formed by the evaporation of urine. The distilled vapour glowed in the dark. As a result of this observation, Brandt named...
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Why the sky is blue?

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Why the sky is blue? We all can look up to the sky and see its beautiful blue colour. Why is it blue, and not red, or white for instance? As I commented in the "Vegetables post", an object is coloured because of the light that it reflects. The white light from the sun contains all the wavelengths, but when it impacts on an object some of its wavelengths are absorbed and some reflected. For example blue objects reflect 'blue' light, which is light with a pretty short wavelength. There is a phenomena named Rayleigh scattering , that consists on the scattering of light by particles much smaller than its wavelength. This effect is especially strong when light passes through gases. Each of the wavelengths of light suffers a different scattering when it encounters the gas particles that form the atmosphere (nitrogen, oxygen...). This effect is more prominent in the case of short light wavelengths, that are the blue end of the visible spectrum, so the...
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The sticky truth about Adhesive tape

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Adhesive tape is a tape that is coated with adhesive either on one side or both, and used for temporarily or permanently joining two overlapping materials. Adhesive tape is something we all use in our daily lives. It serves a number of purposes. Its convenience makes it virtually indispensable in our homes and while at work. If for example, you accidentally tear an important document at work, you reach for an adhesive tape to fix it in a jiffy. Though this invention has become indispensable in our lives, have you ever thought about what is the science behind this invention? History of adhesive tape Natural adhesives like beeswax, resin and bitumen have been used for a long time. The ancient Egyptians used glue made from animal skin and bones for woodworking. Medieval monks used egg white to bind gold leaves to their illuminated manuscripts. The 19th century saw the advent of rubber and pyroxylin cements. Adhesive tape was invented in 1925 by American inventor Richar...
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