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@engineersdigestposts
What is a Contrail? How is it Formed?
A Contrail
ON A CLEAR SUNNY DAY, you might have seen a white trail of cloud behind jet aircrafts; it is called “contrail”- a short name for “condensation trail”. Like other clouds, contrails are made of water vapor. The fuel used in jet aircraft is low grade kerosene, called jet fuel. Jet fuel is a fossil fuel, and like any fossil fuel its combustion produces carbon dioxide and water along with…
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Thermal Pollution: Hot Air, Hot Water, Hot Planet
MORE THAN 80 PERCENT of our global energy needs are fulfilled by combustion of fossil fuels, including coal, oil and natural gas. As a matter of fact, we cannot enjoy our current living standards if we stop burning these fuels. However, contrary to their great utility, burning of fossil fuels in power plants, industrial furnaces and vehicle engines causes air pollution. Although air pollution is…
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Electricity: Why Is It So Common?
Whenever your mobile battery gets low, you plug it in a wall socket, and the mobile starts getting recharged. It seems so mundane! As a matter of fact, electricity, or to be more precise, electric power has become as commonplace for us as food or water. Without electricity, our modern standards of living shall sink like a tumbling wall. From television to microwave oven, all the electrical…
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How Fire Sprinklers Work
Fire sprinklers are life-saving devices that extinguish fire before it gets out of control. They have become a common part of firefighting systems in schools, offices, hotels and factories. Their working is quite simple to understand. In case of a fire, hot air is accumulated in an unventilated, enclosed space such as a hotel room. Since hot air is lighter, it rises above and accumulates along…
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All of us eat-it is essential for living. But many of us have no contribution towards the food that…
All of us eat-it is essential for living. But many of us have no contribution towards the food that we grow. Estimates indicate that during early 19th century, around 41 percent of employed people in United States were somehow related to agriculture; compare this to the 21st century figures- less than two percent of agricultural jobs. The reason for this humongous difference is labor…
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Nuclear Reactions versus Chemical Reactions: Why Atomic Bombs are so Destructive?
THE FIRST ATOMIC BOMB dropped on Hiroshima on 6th of August, 1945 looked like an overgrown cigar. However, the impact of this small lump of uranium, dubbed Little Boy, was beyond human imagination. It was a practical manifestation of the immense energy that might release during a nuclear reaction; no chemical reaction can yield energy in such enormous amounts. To understand this, let us explore…
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World Toilet Day Special: From Wood Shavings to Toilet Paper
Today is world toilet day: an event to signify the importance of good toilet and sanitation conditions worldwide. Though celebrating a day for such a routine object might look a little bizarre, but these are the simple things in life that are the most extraordinary. Well, let us explore a few historic and contemporary facts about this everyday need.
Recent estimates indicate that every person in…
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World Toilet Day: From Wood Shavings to Toilet Paper
Today is world toilet day: an event to signify the importance of good toilet and sanitation conditions worldwide. Though celebrating a day for such a routine object might look a little bizarre, but these are the simple things in life that are the most extraordinary. Well, let us explore a few historic and contemporary facts about this everyday need.
Recent estimates indicate that every person in…
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World Toilet Day: From Wood Shavings to Toilet Paper
Today is world toilet day: an event to signify the importance of good toilet and sanitation conditions worldwide. Though celebrating a day for such a routine object might look a little bizarre, but these are the simple things in life that are the most extraordinary. Well, let us explore a few historic and contemporary facts about this everyday need.
Recent estimates indicate that every person in…
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Nuclear Energy at Powering Ships
A NUCLEAR REACTIONinvolves the split of an atomic nucleus with the release of an enormous amount of energy. If this energy is left unharnessed, it leads to an atomic bomb. However, nuclear energy can be used for peaceful purposes as well; one such example is nuclear powered ships where nuclear fission is used for propulsion of commercial and military marine vessels. How do they work, let us…
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Ancient versus Modern Technology: A Tribute to Primitive Geniuses
If you think that all the modern inventions such as electricity and electric lamps belong to our age, you might be mistaken. As a matter of fact, technological advancements have always been driven by human needs: we felt cold, so we discovered fire, we needed to commute fast, we invented wheel. While we imagine that primitive people had known of only basic machines and tools, archeologists have…
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Alchemy: From Greediness to Personal Salvation
A subjective perspective on alchemy and philosophy
Humans are greedy by nature. They want to live a lavish, healthy life and do not want to die; well, alchemy proves it! While alchemy was a worthwhile intellectual pursuit that led to the development of modern chemistry, it has a philosophical aspect as well. Since ancient times, our ancestors have tried to convert ordinary metals into gold and to…
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Environment and The Industrial Revolution: How Did Pollution Become a Global Issue?
All of us know about environmental pollution. We also know that it is being regarded as a critical challenge at the global scale. As a matter of fact, we are utilizing more natural resources than our planet can replenish, and we are throwing more wastes than the natural cycles can recycle. This is the primary cause of environmental pollution, but how and when did it become a global issue? Humans…
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Erna and Hrefna are identical twins from Iceland who have been photographed every year by Japanese photographer Ariko Inaoka, beginning when they were nine years old in 2009. Ariko intends to visit them every year until they are sixteen years old.
She says: “My intention for this project is to capture the very precious period of their growth from child to teenager, physically as well as psychologically. The relationship between identical twins is interesting subject matter. I often hear that identical twins have telepathic connections between them. This is true with Erna and Hrefna. They are always together. They almost never fight each other. Spending time with them I feel such comfort in their companionship but at the same time I feel strange because I have never seen such a powerful connection between any two human beings. They say to me, “We dream same dreams sometimes.” (Source)
A strong bond
Angra do Heroísmo, in Terceira Island, Azores Archipelago.
Beautiful
Energy: A Term So Ubiquitous, Yet Too Ambiguous
Energy: A Term So Ubiquitous, Yet Too Ambiguous
Everything that happens in the universe is a manifestation of energy at work. Energy seems to be everywhere; without energy, there will be nothing around us: no sun, no rivers, no wind and no life at all. However universal energy might be, its definition is often misrepresented from the perspective of an engineer. While the term has been known for two thousand years, its sloppy use in popular…
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Science, Technology and Engineering: How do They Fit Together
Science, Technology and Engineering: How do They Fit Together
Science is beautiful, because the universe is beautiful; science is infinite, because the universe is infinite. The word “science” comes from the Latin word “scientia” meaning knowledge. Science is the study of the universe around us:Why do stars shine? What makes the sky blue? How did life start? Science explores the answer to these and many other queries related to our cosmos. Much like music,…
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