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(i) 208.91 has five significant figures. (ii) 0.00456 has three significant figures. (iii) 453 has three significant figures. (iv) 2.945 x 10 4 has four significant figures. (v) 0.346 has three significant figures. 2. Express 0.00000345 in scientific notation and calculate the..
Summary
Physics is a branch of science that deals with the nature and natural phenomena. The study of physics finds great importance in our day-to-day life. The laws, formulae and calculations of physics are not merely things to be remembered from the point of view of exams, but their kno..
Physical World and Measurement Summary
Summary - Physics is a branch of science that deals with the nature and natural phenomena. The study of physics finds great importance in our day-to-day life. The laws, formulae and calculations of physics are not merely things to be remembered from the point of view of exams, but their k..
Physical Quantities and their Measurement
The development of chemistry is based upon the systematic approach of the scientists in carrying out different experiments. Scientific theories, inferences and generalizations are made on the observations recorded. The quantitative information involves the measurement of one or more quant..
Global Warming
The natural 'Green-house Effect' is essential for life on earth. Various gases in the atmosphere like water vapour and carbon dioxide trap some of the outgoing radiation from the earth, retain the heat and keep the earth's temperature at levels where living things, including man, can survive. How..
Uses of Nitrogen
Uses of Nitrogen - (i) Nitrogen is used in high temperature thermometers where mercury cannot be used. This is because mercury boils at 356.7 o C and hence cannot be used in such thermometers. A volume of nitrogen is enclosed in a vessel and introduced into the region of high temperature. Depending..
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