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Yogita Ingle 7 years, 1 month ago
Fractional distillation is a process by which components in a chemical mixture are separated into different parts (called fractions) according to their different boiling points. Fractional distillation is used to purify chemicals and also to separate mixtures to obtain their components.
When the boiling points of the two liquids are quite close (difference less than 20-25°C) the separation is not successfully affected by using simple distillation process but is affected by fitting the flask with a fractionating column.
A fractionating column is a long tube provided with obstructions or packed with glass beads. The obstructions provided slows down the passage of vapours upwards and that of the liquid downwards.
Posted by Sneha Mittal 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
Sonar is a device that uses ultrasonic waves to measure the distance, direction and speed of underwater objects. SONAR is also called as echo ranging.
Principle: It uses the phenomenon of echoes in determining the sea-depth and locating the presence of under-water objects.
Posted by Lakshita Kanwar 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
Combustion of fossil fuels produces some important pollutants like unburnt carbon particles. The increase in the levels of these particles results in smog. Smog contains toxic mixture of air pollutants like sulphur dioxide, nitrogen oxides, ozone other volatile organic compounds. The air pollutants from smog cause serious problems to senior citizens, children and people with heart and lung problems leading to emphysema, bronchitis, asthma. Hence combustion of fossil fuels increases the amount of suspended particles in air.
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Yogita Ingle 7 years, 1 month ago
The stratosphere of earth’s atmosphere contains a significant amount of O3. Thus, this gaseous compound protects living organisms including humans from harmful UV radiations (λ 255 nm). Excessive exposure to UV radiation for a longer period of time can cause melanoma or skin cancer in humans.
Furthermore, it can cause many other forms of cancer and other diseases. Overall excessive UV radiation is a threat to any living organism. Hence, it is essential to maintain the ozone layer.
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In summer we perspire more; cotton being a good absorber of water helps in absorbing the sweat and exposes it to the atmosphere for evaporation. When sweat evaporates from our body it takes heat from our body. Thus, our body loses heat and gets cooled.
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Yogita Ingle 7 years, 1 month ago
Body cavity is represented by coelom.
Coelom is the body cavity filled with fluid that runs the complete length of vertebrates to divide the body of an organism into inner tube and outer tube.
*Coelom at embryonic stage, divides the mesoderm into two layers.
*Coelom helps in absorption of shocks.
*Coelom also helps the organisms to grow independently away from the body wall.
*Coelom in mammals is divided into peritoneal, pleural and pericardial cavities
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Sahil Nandode 7 years, 1 month ago
1Thank You