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The Sun is the most important star from our point of view. It is the only star close enough to be studied in considerable detail. The grandeur of the Sun is partly because of its size. Its diameter is almost 110 times that of the Earth. We can best visualise the volume of the Sun if we realise that more than a million earths can be dropped into the space it occupies. As we have said above, the mass of the Sun is about 2 X 1033 grams, which makes it more than 300,000 times the mass of the Earth. The average density of the Sun, i.e.. its mass per unit volume, is about 1.4 g/cm3.
Although the Sun appears to be unchanging, it rotates about its axis once every 25 days. From time to time dark patches appear on the surface of the Sun, usually in pairsor in groups. These dark patches are called sunspots. Their movement is an indication of the Sun's rotation. This fact was recognised for the first tiine by Galileo. Actually, a sunspatis a regiim cn the surface of the S& that consists of gases almkt 10000c cooler than those surrounding the area. The number of sunspots increases and decreases in a cyclc every 11 years. In the long term, there are periods of low number of sunspots and High'number of sunspots.
How the Acid/Base Balance is maintained in an Acid Diet? Let us first see how the acid/base balance is maintained in an acid diet. The sequence of steps involved includes: 1
Define the functions of the Macrophages The macrophages: 1) phagocytose microorganisms and inert particles 2) secrete IL-1 (Interlukin I), TNF (tumor necrosis factor),
Scientific Chemistry: The Arab doctors, perfumers and metallurgists made their greatest contribution in chemistry. This was mainly due to the fact that Arab scholars, unlike
ecological characteristics of deserts
Explain Maintenance of pH - Functions of Bile Maintenance of pH: Bile neutralises the hydrochloric acid and helps to maintain a suitable pH. This prevents the injurious effects
equilibrium, Physics what is the effect of torque and equilibrium on taps, doors,handle bars and bicycles??
Oxidation Weathering by oxidation is common in rocks which are rich in the elements that can be easily oxidised e.g. iron. Iron as Fe 2+ present in a mineral is oxidised to Fe
make a list of food item used at home .categorize them as healthy food [energy giving, body building and protective food] and unhealthy food [fried and greasy]
Water pressure changes with depth Use the funnel and manometer which you made in the last experiment. Fill a tall glass jar or pail with water. Calculate the pressure just belo
How to mount fossils If you occur to live in a locality where fossils are plentiful, it will be interesting to have the peoples make a fossil collection for the school museum.
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