Business
Spirit Airlines said Monday the cancellation of more than 2,800 flights over an 11-day stretch this summer cost the budget airline about $50 million in lost revenue and caused spending to soar.
Aug 17, 2021
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4
Robotics
Roboticists worldwide have been trying to develop autonomous unmanned aerial vehicles (UAVs) that could be deployed during search and rescue missions or that could be used to map geographical areas and for source-seeking. ...
Consumer & Gadgets
Air cleaners (sometimes also called air purifiers or scrubbers) have been used for decades to filter out particles in the air from our homes, offices and laboratories.
Aug 16, 2021
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349
Energy & Green Tech
When smoke from fires darken the skies as they did last summer, hunkering down indoors makes good sense. But on most days throughout the year, the air we breathe indoors carries far more pollutants than outdoor air. Exposure ...
Aug 11, 2021
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37
Energy & Green Tech
For years, there has been a clear downward trend in battery costs. This development is important since batteries, as key components of electric vehicles and stationary energy storage systems, account for the majority of their ...
Aug 11, 2021
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126
Business
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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310
Business
Air France-KLM said Friday that it narrowed its loss in the second quarter and saw the "first signs of recovery" in the aviation sector as countries ease coronavirus restrictions and vaccination campaigns continue apace.
Jul 30, 2021
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3
Energy & Green Tech
At a new playground in central Warsaw, algae feast on pollutants and carbon dioxide to provide a bubble of clean oxygen in a city ranked as one of the most polluted capitals in the EU.
Jul 28, 2021
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3
Security
It was the start of a steamy Friday two Augusts ago when Jason Whisler settled in for a working breakfast at the Coffee Ranch restaurant in the Texas Panhandle city of Borger. The most pressing agenda item for city officials ...
Jul 26, 2021
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18
Energy & Green Tech
A new attempt at purifying New Delhi's notoriously polluted air will see forty giant fans push out filtered air in the heart of the Indian capital's posh downtown shopping district.
Jul 22, 2021
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276
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
