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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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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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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Consumer & Gadgets
"Mad dogs and Englishmen go out in the midday sun," Noel Coward famously sang in 1931, mocking British colonials who ventured out into the scorching midday sun at the hottest time of day. "The Dutch also still think the sun ...
Jul 19, 2021
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Automotive
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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Automotive
General Motors is recalling more than 400,000 pickup trucks in the U.S. because the side air bags can explode without warning and spew parts into the cabin.
Jul 9, 2021
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Energy & Green Tech
Colossal freight locomotives are a fixture of the American landscape, but their 4,400-horsepower engines collectively burn 3.5 billion gallons of diesel annually, at a time when railroads and other fossil fuel users face ...
Jul 7, 2021
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Engineering
This equipment would help tackle the increase of electricity bills during the summer. They are based on using thermo-solar panels to cool the room.
Jul 7, 2021
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Software
As offices nationwide spring back to life, interior space designers and architects will soon have an easy-to-use planning tool to place indoor workplace furniture, staff, partitions and ventilation in a manner that maximizes ...
Jul 6, 2021
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Business
As travel picks up this summer, airlines are dusting off planes that were grounded during the pandemic, checking they are clear of fungus, bugs and bird nests before sending them back in the air.
Jul 4, 2021
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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
