Business
Delta Air Lines saw its profits more than double in the fourth quarter last year, helped by strong travel demand, even as it trimmed its earnings expectations for 2024, the US carrier said Friday.
Jan 12, 2024
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1
Robotics
Researchers have developed a fluid switch using ionic polymer artificial muscles that operates at ultra-low power and produces a force 34 times greater than its weight. Fluid switches control fluid flow, causing the fluid ...
Jan 11, 2024
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Consumer & Gadgets
Despite so many people having air conditioning at home now, many are still unsure how to use it efficiently. And air conditioning uses a lot of energy. For example, running all the lights in an average home all day and night ...
Jan 11, 2024
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1
Engineering
Modifying and upgrading building enclosures and mechanical systems in older, multi-family apartment buildings can achieve net-zero energy-use efficiencies and help inhabitants lower energy costs, breathe better air and live ...
Jan 10, 2024
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14
Energy & Green Tech
A team with the Chemical Institute for Energy and the Environment (IQUEMA) at the University of Cordoba has come up with a battery that uses hemoglobin as an electrochemical reaction facilitator, functioning for around 20–30 ...
Jan 9, 2024
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46
Business
Indonesia has temporarily grounded three Boeing 737-9 Max jetliners, following an incident last week in which an Alaska Airlines plane suffered a blowout that left a gaping hole in the side of the fuselage.
Jan 9, 2024
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6
Consumer & Gadgets
You're inside on a scorching 40°C day, running your air conditioner on full for extended hours. Normally, you might worry about cost—or even the impact on the grid or the environment. But you've got solar on your roof, ...
Dec 21, 2023
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Engineering
Researchers are one step closer to integrating air taxis and other electric vertical takeoff and landing (eVTOL) vehicles into the country's busiest airports, thanks to a new air traffic simulation developed by NASA's Ames ...
Dec 21, 2023
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Business
A top EU court annulled on Wednesday the approval of a pandemic state aid program for Air France-KLM that had been challenged by Irish rival Ryanair and Malta Air.
Dec 20, 2023
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1
Business
Despite national and state border closures during the pandemic, the global aviation market has been growing steadily since 1995, at nearly twice the rate of global GDP each year.
Dec 15, 2023
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2
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
