Setting the airways for urban air mobility
Flying drones are doing great things today, from powerline inspection to security surveillance to precision agriculture (fertilizer and pesticide application).
Jun 17, 2021
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Engineering
Page 33 - News tagged with air
Business
Economic heavyweight Boeing hammered by dual crises
Boeing lost $52 billion on the stock market in a week, a rout that underscores the challenges facing the aircraft manufacturer amid setbacks over the 737 MAX and the coronavirus pandemic.
Mar 15, 2020
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Automotive
US fines Hyundai $47 mn over dirty diesel engines
South Korean shipbuilding and industrial firm Hyundai Heavy Industries will pay a $47 million fine for illegally importing and selling dirty diesel engines in violation of American environmental rules, US authorities announced ...
Sep 20, 2019
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Automotive
Commuters escape Mexico City gridlock in new cable car
Commuters soared over one of the world's biggest and most traffic-clogged cities as a new cable car system went into operation in the Mexican capital on Monday.
Jul 13, 2021
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Engineering
Pentagon debuts its new stealth bomber, the B-21 Raider
America's newest nuclear stealth bomber is making its public debut after years of secret development and as part of the Pentagon's answer to rising concerns over a future conflict with China.
Dec 2, 2022
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Business
US to reopen Boeing-Airbus bidding war over refuellers
The US Air Force is set to reopen a bidding war between Boeing and arch-rival Airbus over the replacement of its ageing fleet of refuelling aircraft essential to Washington's ability to project power beyond its borders.
Aug 11, 2021
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Engineering
How to build greener data centers: Scientists say crank up the heat
Colder is not always better for energy-hungry data centers, especially when it comes to their power bills. A new analysis says that keeping the centers at 41°C, or around 106°F, could save up to 56% in cooling costs worldwide. ...
Oct 18, 2023
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Consumer & Gadgets
Air purifiers: Indoor pollution kills but many devices are ineffective and some may even cause harm
Air pollution kills around 7 million people each year. Most of these deaths occur in developing countries, where solid fuel is often burned in poorly ventilated spaces. However, between 26,000 and 38,000 of those deaths occur ...
Dec 15, 2022
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Engineering
Korean researchers develop portable system that harvests water from air
An eco-friendly technology inspired by plant and animal mechanisms has been developed in South Korea for the first time. The portable moisture-harvesting system collects moisture from the air, purifies it, and produces drinkable ...
Aug 20, 2024
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Business
Mapping the inequalities of low-carbon electricity
Greenhouse gas reduction, new jobs, new investment opportunities: the benefits of decarbonizing the electricity sector—one of the most polluting—are obvious. However, a transition to lower-carbon electricity production ...
May 2, 2023
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Earth's atmosphere
The Earth's atmosphere is a layer of gases surrounding the planet Earth that is retained by the Earth's gravity. It has a mass of about five quadrillion metric tons. Dry air contains roughly (by volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, and trace amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night.
There is no definite boundary between the atmosphere and outer space. It slowly becomes thinner and fades into space. An altitude of 120 km (75 mi) marks the boundary where atmospheric effects become noticeable during atmospheric reentry. The Kármán line, at 100 km (62 mi), is also frequently regarded as the boundary between atmosphere and outer space. Three quarters of the atmosphere's mass is within 11 km (6.8 mi; 36,000 ft) of the surface.
This text uses material from Wikipedia, licensed under CC BY-SA
