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Published byLydia Potter Modified over 9 years ago
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HULTON ARCHIVE/GETTY IMAGESGETTY IMAGES Topic 7: Machines Throughout History
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What are some reasons machines have changed through history? Technological advancements Changes in society Societal/environmental concerns
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The Steam Engine Invented in late 18 th century Burns a fuel like coal or wood to change water to steam outside the engine (external combustion) When the water changes from liquid to gas it expands a lot (2,000 L of water = 2,000,000 L of steam) The pressure of the steam allows it to push the pistons Steam is a high quality form of energy and it is easily transferred to mechanical systems How steam engines work How steam engines work
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The Internal Combustion Engine Fuel is burned inside the engine More efficient, smaller, lighter Has 4, 6 or 8 pistons, not all pistons are at the same steps at same time the internal combustion engine the internal combustion engine Car engines Car engines
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