Machine learning & AI
Artificial intelligence employed by the U.S. military has piloted pint-sized surveillance drones in special operations forces' missions and helped Ukraine in its war against Russia. It tracks soldiers' fitness, predicts when ...
Nov 25, 2023
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Software
Before airplanes even reach the runway, pilots must file a plan to inform air traffic controllers where they're going and the path they are going to take. When planes are in the air, however, that plan often changes. From ...
Nov 24, 2023
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Engineering
A research team has successfully developed an environmentally friendly refrigerant compressor using an electrochemical method instead of a mechanical method. The development is published in Renewable Energy.
Nov 24, 2023
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13
Engineering
Converting office space to housing units sounds like a win–win in the post-pandemic world of remote work and scarce housing.
Nov 22, 2023
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Energy & Green Tech
At an upmarket restaurant in the hotpot-loving Chinese city of Chengdu, diners plunge sliced meat and vegetables into cauldrons of spicy, oily broth, largely unaware that their leftovers are set to take on a second life as ...
Nov 21, 2023
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13
Engineering
A team of engineers at the Luxembourg Institute of Science and Technology, working with a pair of colleagues from Murata Manufacturing Company, has developed a regenerative electrocaloric heat pump that is more efficient ...
Telecom
It is estimated that 95% of the planet's population has access to broadband internet, via cable or a mobile network. However, there are still some places and situations in which staying connected can be very difficult. Quick ...
Nov 16, 2023
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Consumer & Gadgets
As night falls earlier and temperatures drop, it's time to get cozy under a blanket and brew your favorite tea.
Nov 16, 2023
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Energy & Green Tech
Lithium-air batteries, sometimes known as lithium-oxygen batteries (Li-O2), comprise a lithium metal anode, an organic electrolyte and a porous carbon cathode. During discharge, oxygen in the surrounding air reacts with lithium ...
Nov 14, 2023
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Energy & Green Tech
A floating, solar-powered device that can turn contaminated water or seawater into clean hydrogen fuel and purified water, anywhere in the world, has been developed by researchers.
Nov 13, 2023
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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
