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Why does water stay cool in earthen clay pots?
Have you ever had a drink of cool refreshing water from a ‘matka’ or earthen clay pot placed outside? Surprisingly enough, the pots are exposed to blazing sunlight, yet the water within stays so cool. How is that possible? This is because of a physical process known as evaporation. When a liquid changes to a gaseous (or vapour) state without boiling, it is known as evaporation. A matka is made of mud and has many minute pores (extremely small holes)....
Why is the Dead Sea dead?
The Dead Sea is indeed a very scary name for a lake. It is called so because nothing lives in it. There are no sea weeds or plants, no fish either. This is because the Dead Sea is nearly six times as salty as the ocean. It also contains many other dissolved minerals, including magnesium chloride, calcium chloride and potassium chloride in large quantities. Whereas in fresh water, only minute quantities of these minerals are found....
Is New York Burning?
In New York, people consume about 500 million kilowatt hours of energy per square kilometre every year. This is almost half of the total amount of solar energy (heat of the sun rays) falling on such an area in a year. So New Yorkers, in effect, live under a sun-and-a-half. In addition, paved areas, walls and the roofs of buildings absorb and re-radiate more heat than soil or plant-covered ground. Water runs off these surfaces more rapidly, allowing little cooling by evaporation....
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