Engineering
Whether in photosynthesis or in a photovoltaic system: If you want to use light efficiently, you have to absorb it as completely as possible. However, this is difficult if the absorption is to take place in a thin layer of ...
Aug 29, 2022
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Consumer & Gadgets
A motorcycle helmet that filters out harmful emissions from the air is protecting riders in New Delhi and other Indian cities that rank among the most polluted in the world.
Aug 26, 2022
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Energy & Green Tech
In an effort to reduce the risks from climate change, NIST scientists have set out to discover new materials that can draw planet-warming carbon dioxide (CO2) out of the atmosphere, a technique called "direct air capture."
Aug 25, 2022
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Engineering
Gas turbines are widely used for power generation and aircraft propulsion. According to the laws of thermodynamics, the higher the temperature of an engine, the higher the efficiency. Because of these laws, there is an emerging ...
Aug 25, 2022
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Automotive
California set itself on a path Thursday to end the era of gas-powered cars, with air regulators adopting the world's most stringent rules for transitioning to zero-emission vehicles.
Aug 25, 2022
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Business
Writing in the International Journal of Intellectual Property Management, a digital technology leader at telecommunications conglomerate Verizon discusses the impact of the COVID-19 pandemic on digital transformation and ...
Aug 8, 2022
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Automotive
Whenever automakers discover that a vehicle has a defect or does not comply with U.S. laws, they must notify the National Highway Traffic Safety Administration and mail a notice to each customer who owns or leases the affected ...
Aug 3, 2022
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Energy & Green Tech
Extreme heat waves and record temperatures are straining energy infrastructure nationwide, which is contributing to a global energy crisis, says Virginia Tech expert Saifur Rahman.
Jul 26, 2022
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Energy & Green Tech
As extreme heatwaves ravage the United States, Europe and Africa, killing thousands, scientists warn that the worst is still to come. With countries continuing to pump greenhouse gasses into the atmosphere and the chance ...
Jul 22, 2022
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Engineering
The UK's rail service has been hit with widespread train delays and high levels of cancelations during the heatwave. The whole of the east coast line between Edinburgh and London was closed for hours on July 20 because of ...
Jul 22, 2022
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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
