One of the challenges engineers face when developing technologies for use in space is that of different gravities. Mostly, engineers only have access to test beds that reflect either Earth's normal gravity or, if they're ...
Space Exploration
Jul 24, 2024
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Nitrate contamination in water has long presented threats to the environment and human health. Now, Yale researchers have developed an efficient and effective way to remove it.
Analytical Chemistry
Jul 19, 2024
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A new UBC study published recently in Proceedings of the National Academy of Science has unveiled insights into how microscopic organisms such as marine plankton move through water with different density layers.
Ecology
Jul 15, 2024
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346
The monarch butterfly, Danaus plexippus, is renowned for its striking appearance and perhaps even more than that, its remarkable long-distance migration. The population present in North America heads south each year in the ...
Soft Matter
Jul 11, 2024
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Pouring cream into coffee creates a show of eddies that rivals Jupiter's roiling storms. But one clank of the spoon collapses all that black and tan chaos into a smooth, uniform brown. It turns out there's a lot to that mixing. ...
Polymers
Jul 11, 2024
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2
Researchers at Finland's Aalto University have found a way to use magnets to line up bacteria as they swim. The approach offers more than just a way to nudge bacteria into order—it also provides a useful tool for a wide ...
Condensed Matter
Jul 5, 2024
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Researchers at Fraunhofer IPM have developed a contactless flow measurement method based on magnetic fields. For the first time, they have been able to show the quantitative impact of the flow profile on the magnetic signal. ...
Soft Matter
Jul 2, 2024
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The more we discover about the natural world, the more we find that nature is the greatest engineer. Past research believed that liquids can only be transported in fixed direction in species with specific liquid communication ...
Biotechnology
Jul 2, 2024
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61
When people think of honey bees, they often think of classic wooden hives, in which beekeepers are having to breed more and more bees just to keep managed populations stable. These man-made boxes, designed to facilitate pollination ...
Plants & Animals
Jul 1, 2024
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45
Most of us are familiar with the classic example of a liquid-gas moving contact line on a solid surface: a raindrop, sheared by the wind, creeps along a glass windscreen. The contact line's movements depend on the interplay ...
Soft Matter
Jun 26, 2024
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In physics, a fluid is a substance that continually deforms (flows) under an applied shear stress, no matter how small. Fluids are a subset of the phases of matter and include liquids, gases, plasmas and, to some extent, plastic solids.
In common usage, "fluid" is often used as a synonym for "liquid", with no implication that gas could also be present. For example, "brake fluid" is hydraulic oil and will not perform its required function if there is gas in it. This colloquial usage of the term is also common in medicine and in nutrition ("take plenty of fluids").
Liquids form a free surface (that is, a surface not created by the container) while gases do not. The distinction between solids and fluid is not entirely obvious. The distinction is made by evaluating the viscosity of the substance. Silly Putty can be considered to behave like a solid or a fluid, depending on the time period over which it is observed. It is best described as a viscoelastic fluid. There are many examples of substances proving difficult to classify. A particularly interesting one is pitch, as demonstrated in the pitch drop experiment currently running at the University of Queensland.
This text uses material from Wikipedia, licensed under CC BY-SA
