Engineering
Despite their deceptively simple function of transferring heat from one medium to another, heat exchangers are of utmost importance in machines. Heat exchange between two fluids depends on the material of the heat exchangers, ...
Oct 20, 2021
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Engineering
Southwest Research Institute engineers have developed the next generation of clean diesel engine technology to reduce hazardous nitrogen oxides (NOx) and carbon dioxide emissions while minimizing fuel consumption. Working ...
May 26, 2020
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2102
Engineering
Stanford University engineers have developed an airborne method for imaging underwater objects by combining light and sound to break through the seemingly impassable barrier at the interface of air and water.
Dec 1, 2020
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Engineering
The ultimate target of many environmental interventions is to drastically reduce CO2 emissions and minimize its presence in the air. One tool that could help to achieve this goal is direct air capture (DAC) technology, which ...
Consumer & Gadgets
Opening the windows at night and pulling down shades during the sunniest part of the afternoon can keep homes from becoming dangerously hot during extreme heat waves.
Jun 24, 2022
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Energy & Green Tech
Kristof Retezár, an Austrian designer, has come up with Fontus, which was designed as a self-filling water bottle for your bicycle. This device collects the moisture from the air, condenses it and stores it as safe drinking ...
Engineering
Standard comfort measurements used to design buildings' heating and cooling systems share a common flaw, according to new research. The researchers said the findings could mean that designers have relied on inaccurate measurements ...
Feb 14, 2020
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601
Energy & Green Tech
The California Air Resources Board has adopted a regulation that requires truck and engine manufacturers to reduce the nitrogen oxide (NOx) emissions from new heavy-duty trucks by 90 percent starting in 2027. NOx from heavy-duty ...
Sep 16, 2021
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Engineering
Inspired by a close encounter with a fellow aircraft during his years as a novice pilot, Merlin Labs founder Matt George found himself drawn to the idea of applying ground transportation safety methods to air traffic. Now, ...
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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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
