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Posts tagged "Science Facts" (Page 54)
How does steam work engines? When water is boiling in a kettle steam rushes out of the spout and lid with great force. It often moves the lid up and down as it escapes. This force is what drives steam engines. A fire heats water in a boiler, sending steam to a cylinder. This is a short, strong pipe with a round piston inside, which can move up and down. When...
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September 13, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
Who built the first railway? In 1803 Richard Trevithick, a Cornishman, used a steam locomotive to pull coal wagons on a special track. This was the first time an engine, instead of horses, had been used for this. The first passenger railway in Europe was the Liverpool and Manchester Railway. This opened in 1830. It used a steam engine built by George Stephenson called the ‘Rocket’. In the USA the Baltimore...
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September 13, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
Why were silkworms smuggled to Constantinople? Silk had long been prized as the most valuable of al materials – it was literally worth weight in gold when the Byzantine Emperor Justinian, (AD 483 AD 565), set up a weaving industry in his capital city of Constantinople. Raw silk was always imported from China, where, for countless centuries, the art of producing silk was a closely guarded secret. However, Justinian persuaded two...
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September 13, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
When did wool first become widely used? Ever since the days of Ancient Greece, wool has played a very important part in clothing. Roman togas were made of wool and it continued to be woven during the Dark Ages. In fact, it was the only material available to most people. The woollen clothes worn during the first half of the Middle Ages were simple and made for warmth. Houses and...
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September 13, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
Who wove the finest linen in the Ancient World? The ancient Egyptians grew an enormous amount of flax which was then spun and woven into linen. Linen is strong and cool and smooth to wear, and Egyptian linen was incredibly fine, sometimes almost trans-parent. This fine weaving has never been matched, even with the advanced machines used in textile mills today. It was the quality of material that distinguished the...
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September 13, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
When did man first wear clothes? Look at the clothes you are wearing, you will ‘ find that they are made of a great variety of fabrics. We are fortunate that they are all available, imagine what it must have been like with nothing to protect you from the bitterest weather! We do not know when man first wore clothes, but large numbers of flint scrapers found in Old Stone...
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September 13, 2017 evirtualguru_ajaygourParagraph WritingNo Comment
What other kinds of energy can we use? You have seen in the previous question the stages through which the Sun’s energy passes before we can tap it as the fossil fuel, petrol. It has taken millions of years for the world’s reserves of oil to be built up and we have consumed much of it in a few decades. We need energy in our homes and in industry and for...
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September 13, 2017 evirtualguru_ajaygour10th Class, 9th Class, Class 11, Class 12, General Knowledge, Paragraph WritingNo Comment
How does the Sun power a Racing Car? A racing car as you know has a petrol-driven engine. The petrol is a fossil fuel ultimately depending on the Sun’s energy, as we shall see. On a sunny day you can feel the Sun’s rays warming your face. The Sun is applying energy in the form of heat. Solid as it may look, the Sun is completely made up of gas, so...
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September 13, 2017 evirtualguru_ajaygour10th Class, 9th Class, Class 11, Class 12, General Knowledge, Paragraph WritingNo Comment
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