Business
Air travel continued to be severely disrupted in the United States on Saturday, with bad weather in parts of the country adding to the impact of a massive spike in Covid-19 infections fuelled by the Omicron variant.
Jan 2, 2022
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Engineering
Southwest Research Institute engineers are advancing what researchers know about hypersonic flight. A new study presented at the 2019 Joint Army-Navy-NASA-Air Force (JANNAF) Propulsion Meeting describes a series of tests ...
Oct 8, 2019
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Automotive
If air taxis become a viable mode of transportation, Oak Ridge National Laboratory researchers have estimated they could reduce fuel consumption significantly while alleviating traffic congestion.
Dec 2, 2020
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Energy & Green Tech
When the UK government cancelled its plans to electrify train lines across Wales, the Midlands and the north of England, and cut back on the Great Western rail network electrification, it brought a premature end to a rail ...
Jan 30, 2019
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Business
Microsoft is joining cybersecurity software firm CrowdStrike in fighting back against Delta Air Lines, which blames the companies for causing several thousand canceled flights following a technology outage last month.
Aug 7, 2024
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A coalition of states is following California's lead in setting goals to jump-start a transition to electric-powered trucks, vans and buses in order to reduce greenhouse gas emissions and improve air quality for communities ...
Jul 19, 2020
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Business
United Airlines warned Wednesday it could lay off as many as 36,000 workers on October 1 as the US carrier fights for survival amid the coronavirus crisis.
Jul 8, 2020
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Business
Concerns are mounting among policymakers and utility companies amid the impact of severe weather on the nation's electrical grids. In recent months, electrical grids in Texas have been tested to the point of near failure. ...
Feb 8, 2023
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Engineering
Investment in electrical transmission and distribution (T&D) systems could significantly reduce air pollution, according to a study led Lauren Janicke, an undergraduate in civil and environmental engineering (CEE), and Destenie ...
Feb 27, 2023
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Business
France on Tuesday denounced as "blackmail" an ultimatum from low-cost carrier Ryanair for its French employees to choose between a five-year pay cut or a number of redundancies in an escalating labour dispute.
Jun 2, 2020
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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
