Electricity is generated at power stations through large generations. Normally power stations are of two types: Hydraulic and thermal. These power stations are at a distance from cities to avoid pollution…… [… More info ..]
Dyes are colour substances which impart their colour to the fabrics on which they are applied and for which they have a chemical affinity. Until the middle of the last century the dyes available were natural products obtained…. [… More info ..]
Dry cleaning is method of cleaning fabrics with chemical solvents instead of soap and water. Petrol is the most important of them. Benzene is also used in dry cleaning. Some safer synthetic chemicals such as polychloroalkanes and alkanes have also been developed…. [… More info ..]
When we hear the sound of a police car speeding past us with its siren blaring or a train roaring past another tain we experience something strange happening to the pitch of the sound. The sound seems to get higher as the car approches and lower as it goes past…. [… More info ..]
A telescope is an optical instrument used to see distant objects clearly and magnified. The telescope was invented in 1608 by a Dutch optician Hans Lippershey. In 1609 the italian astronomer Galileo made his first telescope and observed the rings of saturn and jupiter’s moon….. [… More info ..]
The first detergent was developed was in 1916 by a German scientist called Fritz Gunther. Since then their use has been on the constant increase. A Detergent is an organic substance composed of carbon, oxygen sulphar and hydrogen compounds. When combined with water it helps to clean soiled materials…. [… More info ..]
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