Engineering
In the coming decades, renewable energy sources such as solar and wind will increasingly dominate the conventional power grid. Because those sources only generate electricity when it's sunny or windy, ensuring a reliable ...
Apr 10, 2023
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34
Engineering
Chemists and engineers find innovative ways to access water—including by pulling it out of thin air. Now, University of Chicago researchers found a way to extract even more water.
Mar 30, 2023
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338
Energy & Green Tech
Large quantities of hydrogen will be needed to ensure a successful energy transition. As part of the HighHy project, an international team of researchers from Germany and New Zealand is working on improving the efficiency ...
Mar 1, 2023
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3
Energy & Green Tech
Our current solar panels aren't very efficient; they are only able to convert up to about 20% of the sun's energy into electricity. As a result, to generate a lot of electricity, the panels require a lot of space—sometimes ...
Feb 18, 2023
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51
Engineering
Dr. Seol Seung-Kwon's Smart 3D Printing Research Team at KERI and Professor Lim-Doo Jeong's team at Ulsan National Institute of Science and Technology (UNIST) developed core technology for smart contact lenses that can implement ...
Feb 14, 2023
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96
Computer Sciences
Artificial intelligence (AI) is transforming modern electronics—accelerating the design of bendable TV screens, ultra-lightweight revolutionized solar cells and more.
Feb 7, 2023
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227
Energy & Green Tech
A team of engineering and materials scientists from China, Australia and the U.S. has developed a process for using sea water to produce hydrogen without having to first pretreat the water. In their paper published in the ...
Engineering
It happens far too often: you plug your laptop in and walk away only to return hours or days later to find it has lost some of its charge despite sitting idle and unused.
Jan 17, 2023
3
525
Energy & Green Tech
Perovskite solar cells (PSCs) can be made with low-cost materials, are highly efficient, can surpass traditional silicon solar cells, and have the potential to revolutionize renewable energy. However, one of the current drawbacks ...
Jan 12, 2023
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91
Engineering
Australia is well-positioned to be a global leader in green hydrogen production. Green hydrogen is produced using a renewable power source such as solar or wind. As a substitute for fossil fuels, it will help to meet growing ...
Dec 21, 2022
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A molecule is defined as a sufficiently stable, electrically neutral group of at least two atoms in a definite arrangement held together by very strong (covalent) chemical bonds. Molecules are distinguished from polyatomic ions in this strict sense. In organic chemistry and biochemistry, the term molecule is used less strictly and also is applied to charged organic molecules and biomolecules.
In the kinetic theory of gases the term molecule is often used for any gaseous particle regardless of its composition. According to this definition noble gas atoms are considered molecules despite the fact that they are composed of a single non-bonded atom.
A molecule may consist of atoms of a single chemical element, as with oxygen (O2), or of different elements, as with water (H2O). Atoms and complexes connected by non-covalent bonds such as hydrogen bonds or ionic bonds are generally not considered single molecules.
No typical molecule can be defined for ionic crystals (salts) and covalent crystals (network solids), although these are often composed of repeating unit cells that extend either in a plane (such as in graphene) or three-dimensionally (such as in diamond or sodium chloride). The theme of repeated unit-cellular-structure also holds for most condensed phases with metallic bonding. In glasses (solids that exist in a vitreous disordered state), atoms may also be held together by chemical bonds without any definable molecule, but also without any of the regularity of repeating units that characterises crystals.
This text uses material from Wikipedia, licensed under CC BY-SA
