Engineering
Many people beat the summer heat by cranking the air conditioning. However, air conditioners guzzle power and spew out millions of tons of carbon dioxide daily. They're also not always good for your health—constant exposure ...
Aug 18, 2020
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Hi Tech & Innovation
NASA and Lockheed Martin formally debuted the agency's X-59 quiet supersonic aircraft Friday. Using this one-of-a-kind experimental airplane, NASA aims to gather data that could revolutionize air travel, paving the way for ...
Jan 15, 2024
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Energy & Green Tech
When the blades of its 800-kilowatt wind turbine start turning, the small Greek island of Tilos will become the first in the Mediterranean to run exclusively on wind and solar power.
Aug 19, 2018
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761
Engineering
Seventy-five years ago, a sonic boom thundered for the first time over the high desert of California.
Oct 18, 2022
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Engineering
Boeing said Wednesday its prototype "flying car"—part of a project aimed at "on-demand autonomous air transportation"—has completed its first successful test flight.
Jan 23, 2019
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716
Energy & Green Tech
To battle the summer heat, office and residential buildings tend to crank up the air conditioning, sending energy bills soaring. Indeed, it's estimated that air conditioners use about 6 percent of all the electricity produced ...
Nov 8, 2018
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Engineering
In 2017, UC Berkeley chemists demonstrated that a new MOF design could rapidly adsorb water from even dry air, allowing it to be condensed and collected for drinking. A second-generation MOF can now cycle through adsorption ...
Aug 28, 2019
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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 ...
Energy & Green Tech
An air conditioning system that offers zero emissions, cools the house with water and is powered by natural gas was getting attention this week at CES.
Engineering
Mohammad Asadi, assistant professor of chemical engineering at Illinois Institute of Technology, has published a paper in the journal Science describing the chemistry behind his novel lithium-air battery design. The insights ...
Feb 2, 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
