Engineering
Stanford researchers have developed a reversible fabric that, without expending effort or energy, keeps skin a comfortable temperature whatever the weather.
Nov 13, 2017
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23
Energy & Green Tech
It looks like a regular roof, but the top of the Packard Electrical Engineering Building at Stanford University has been the setting of many milestones in the development of an innovative cooling technology that could someday ...
Sep 5, 2017
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Engineering
When you post video of your new jet powered hoverboard, and half the world thinks it has to be fake, you know you've got something good. But Frank Zapata's Flyboard Air is no hoax, it's the real deal. How does one know? All ...
Energy & Green Tech
Metal-air batteries are attractive prospects for creating a battery that is light-weight, high-powered, and long-lasting. However, one of the problems keeping lithium-air batteries from practical use is the accumulation of ...
Engineering
Chances are you've never considered the act of breathing. Our lungs' gentle rise and fall is autonomic, pulling air in and nourishing our body with oxygen before expelling wastes like carbon dioxide (CO2).
Aug 19, 2024
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Energy & Green Tech
Green hydrogen is emerging as an important potential solution for decarbonizing transportation, but new energy efficiency findings indicate that it should be used strategically in heavy-duty road, rail, aviation and marine ...
Aug 7, 2024
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Automotive
Many airline passengers naturally worry about flying. But on a worldwide basis, commercial air travel keeps getting safer, according to a new study by MIT researchers.
Aug 7, 2024
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Energy & Green Tech
The struggle to cut emissions is real. Last year, the world emitted more than 37 billion metric tons of carbon dioxide, setting a new record high. As a result, sucking CO2 out of the atmosphere has become an increasingly ...
Jul 22, 2024
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15
Energy & Green Tech
Direct air capture was identified as one of the "seven chemical separations to change the world." This is because although carbon dioxide is the main contributor to climate change (we release ~40 billion tons into the atmosphere ...
Jul 19, 2024
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72
Energy & Green Tech
Deliveries are getting faster than ever in the U.S., but the faster movement of goods is undercutting the country's climate progress.
Jul 18, 2024
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51
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
