Energy & Green Tech
Zinc-air batteries are an inexpensive, powerful battery alternative that can be used on a small scale to power electronics or on a large scale for electric vehicles or energy storage. These batteries work when oxygen from ...
Feb 27, 2024
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Energy & Green Tech
A new approach to waste management could help villages in rural India cut indoor air pollution, improve soil health, and generate clean power, researchers say.
Feb 23, 2024
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Hi Tech & Innovation
As the aviation sector seeks ways to make air travel less polluting and more sustainable, aerospace company Embraer and South Korean automaker Hyundai are among the companies betting on a new form of air travel -– air taxis.
Feb 22, 2024
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Engineering
Imagine you're driving to work on a rainy day, when a distracted, reckless driver hits your car out of nowhere. With a "boom," an air bag deploys faster than you can blink your eyes to save your life.
Feb 21, 2024
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Energy & Green Tech
In September, the governing board of Santa Cruz Metro made a big bet on the future of green public transit when it approved the purchase of 57 buses fueled by hydrogen—the largest order of hydrogen-fueled buses made so ...
Feb 14, 2024
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Robotics
With a brief squeeze, you know whether an avocado, peach or tomato is ripe. This is what a soft robot hand also does, for example, during automated harvesting. However, up until now, such a gripper needed sensors in its 'fingers' ...
Feb 13, 2024
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Energy & Green Tech
Millions of U.S. households would benefit from heat pumps, but the cost of installing the technology needs to come down to make their use a more attractive proposition, according to researchers at the U.S. Department of Energy's ...
Feb 13, 2024
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Engineering
A new, independent field investigation into the aftermath of the Turkey–Syria earthquakes has found that a drive for profit has pushed all players within the construction industry to take shortcuts, with building stock ...
Feb 9, 2024
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Business
A top EU court on Wednesday again annulled the approval of a pandemic state aid program for Dutch airline KLM, handing a fresh victory to its Irish rival Ryanair.
Feb 7, 2024
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Engineering
A new system to heat Quebec schools during cold winter months could help keep students more comfortable, improve the amount of solar-heated clean ventilation, and save school boards a bundle.
Feb 6, 2024
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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
