Energy & Green Tech
As the COVID-19 shutdowns and stay-at-home orders brought much of the world's travel and commerce to a standstill, people around the world started noticing clearer skies as a result of lower levels of air pollution. Now, ...
Jul 22, 2020
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5
Robotics
Engineering researchers at North Carolina State University and Temple University have developed soft robots inspired by jellyfish that can outswim their real-life counterparts. More practically, the new jellyfish-bots highlight ...
Jul 1, 2020
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111
Energy & Green Tech
The search for renewable energy sources, which include wind, solar, hydroelectric dams, geothermal, and biomass, has preoccupied scientists and policymakers alike, due to their enormous potential in the fight against climate ...
Jun 9, 2020
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Consumer & Gadgets
Whether it comes from second-hand cigarette smoke, motor vehicle exhaust, building materials or the fumes from household cleaning supplies, toxic air is all around us.
May 8, 2020
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Machine learning & AI
Imagine being scared to breathe the air around you.
Mar 18, 2020
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Engineering
For decades, researchers have considered the potential for cooling hot electronic devices by blowing on them with high-speed air jets. However, air jet cooling systems are not widely used today. Two of the biggest obstacles ...
Feb 18, 2020
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198
Engineering
Standard comfort measurements used to design buildings' heating and cooling systems share a common flaw, according to new research. The researchers said the findings could mean that designers have relied on inaccurate measurements ...
Feb 14, 2020
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601
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.
Business
Hyundai announced Monday it would mass produce flying cars for Uber's aerial rideshare network set to deploy in 2023.
Jan 7, 2020
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852
Energy & Green Tech
The effectiveness of non-mechanical, low-energy methods for moderating temperature and humidity has been evaluated in a series of experiments by researchers from the University of Cambridge.
Nov 20, 2019
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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
