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Headline:    

What Is Surface Tension? Definition and Experiments

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8 Minutes, 21 Seconds

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surface tension

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surface tension

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tension ✓ Soap ✓ pressure ✓ water ✓ Angle ✓ Bubble ✓ contact ✓ paper ✓ Surface ✓ Needle ✓ Glass ✓ gamma ✓ liquid ✓ surfaces ✓ drop

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If, on the other hand, the meniscus is concave (i.e. dips down, so the contact angle is less than 90 degrees), then the cos theta term is positive, in which case the relationship would result in a negative liquid-solid surface tension! What this means, essentially, is that the liquid is adhering to the walls of the container and is working to maximize the area in contact with solid surface, so as to minimize the overall potential energy. This trick requires a real steady hand and some practice, because you must remove the fork in such a way that portions of the needle do not get wet .

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<p style="display: none;"> <script type="application/ld+json">{ "@context": "https://schema.org", "@type": "Article", "image": { "@type": "ImageObject", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "name": "Article", "url": "https://www.artikelschreiber.com/en/", "description": " ... https://www.artikelschreiber.com/en/", "headline": "What Is Surface Tension? Definition and Experiments", "dateCreated": "2022-01-18T03:02:19+01:00", "datePublished": "2022-01-18T03:02:19+01:00", "dateModified": "2022-01-18T03:02:19+01:00", "articleBody": "If on the other hand the meniscus is concave (i.e. dips down so the contact angle is less than 90 degrees) then the cos theta term is positive in which case the relationship would result in a negative liquid-solid surface tension! What this means essentially is that the liquid is adhering to the walls of the container and is working to maximize the area in contact with solid surface so as to minimize the overall potential energy. This trick requires a real steady hand and some practice because you must remove the fork in such a way that portions of the needle do not get wet . Source: https://www.artikelschreiber.com/en/.", "mainEntityOfPage": { "@type": "WebPage", "@id": "https://www.artikelschreiber.com/en/#webpage" }, "publisher": { "@type": "Organization", "@id": "https://www.artikelschreiber.com/en/#organization", "url": "https://www.artikelschreiber.com/en/", "name": "ArtikelSchreiber.com", "description": "Your free SEO text generator | ArtikelSchreiber.com", "logo": { "@type": "ImageObject", "@id": "https://www.artikelschreiber.com/en/#logo", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "image": { "@type": "ImageObject", "@id": "https://www.artikelschreiber.com/en/#logo", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "sameAs": [ "https://www.unaique.net/" ] }, "keywords": "tension, Soap, pressure, water, Angle, Bubble, contact, paper, Surface, Needle, Glass, gamma, liquid, surfaces, drop", "author": { "@type": "Person", "name": "ArtikelSchreiber.com", "url": "https://www.artikelschreiber.com/en/", "sameAs": [ "https://www.unaique.net/" ] }, "@id": "https://www.artikelschreiber.com/en/#links", "commentCount": "0", "sameAs": [ "https://www.artikelschreiber.com/", "https://www.artikelschreiber.com/en/", "https://www.artikelschreiber.com/es/", "https://www.artikelschreiber.com/fr", "https://www.artikelschreiber.com/it", "https://www.artikelschreiber.com/ru/", "https://www.artikelschreiber.com/zh", "https://www.artikelschreiber.com/jp/", "https://www.artikelschreiber.com/ar", "https://www.artikelschreiber.com/hi/", "https://www.artikelschreiber.com/pt/" ], "speakable": { "@type": "SpeakableSpecification", "xpath": [ "/html/head/title", "/html/head/meta[@name='description']/@content" ] } } </script> </p><br /><br /> .
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<p style="display: none;"> <script type="application/ld+json">{ "@context": "https://schema.org", "@type": "Article", "image": { "@type": "ImageObject", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "name": "Article", "url": "https://www.artikelschreiber.com/en/", "description": " ... https://www.artikelschreiber.com/en/", "headline": "What Is Surface Tension? Definition and Experiments", "dateCreated": "2022-01-18T03:02:19+01:00", "datePublished": "2022-01-18T03:02:19+01:00", "dateModified": "2022-01-18T03:02:19+01:00", "articleBody": "Surface tension is a phenomenon in which the surface of a liquid where the liquid is in contact with a gas acts as a thin elastic sheet. This term is typically used only when the Liquid Surface is In Contact With Gas (such as the Air). If the Surface Is Between Two Liquids it is called interface tension. Source: https://www.artikelschreiber.com/en/.", "mainEntityOfPage": { "@type": "WebPage", "@id": "https://www.artikelschreiber.com/en/#webpage" }, "publisher": { "@type": "Organization", "@id": "https://www.artikelschreiber.com/en/#organization", "url": "https://www.artikelschreiber.com/en/", "name": "ArtikelSchreiber.com", "description": "Your free SEO text generator | ArtikelSchreiber.com", "logo": { "@type": "ImageObject", "@id": "https://www.artikelschreiber.com/en/#logo", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "image": { "@type": "ImageObject", "@id": "https://www.artikelschreiber.com/en/#logo", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "sameAs": [ "https://www.unaique.net/" ] }, "keywords": "tension, Soap, pressure, water, Angle, Bubble, contact, paper, Surface, Needle, Glass, gamma, liquid, surfaces, drop", "author": { "@type": "Person", "name": "ArtikelSchreiber.com", "url": "https://www.artikelschreiber.com/en/", "sameAs": [ "https://www.unaique.net/" ] }, "@id": "https://www.artikelschreiber.com/en/#links", "commentCount": "0", "sameAs": [ "https://www.artikelschreiber.com/", "https://www.artikelschreiber.com/en/", "https://www.artikelschreiber.com/es/", "https://www.artikelschreiber.com/fr", "https://www.artikelschreiber.com/it", "https://www.artikelschreiber.com/ru/", "https://www.artikelschreiber.com/zh", "https://www.artikelschreiber.com/jp/", "https://www.artikelschreiber.com/ar", "https://www.artikelschreiber.com/hi/", "https://www.artikelschreiber.com/pt/" ], "speakable": { "@type": "SpeakableSpecification", "xpath": [ "/html/head/title", "/html/head/meta[@name='description']/@content" ] } } </script> </p><br /><br /> Surface tension is a phenomenon in which the surface of a liquid, where the liquid is in contact with a gas, acts as a thin elastic sheet. This term is typically used only when the Liquid Surface is In Contact With Gas (such as the Air). If the Surface Is Between Two Liquids, it is called "interface tension". Surface Tension Drops of water. When using a water dropper, the water does not flow in a continuous stream, but rather in. . . series of drops. The shape of the drops is caused by the surface tension of. . . water. The force of gravity pulling down on water is the only reason the drop of water isn't completely spherical. The drop would minimize the surface area in order to minimize tension, which would result in a perfectly spherical shape. Several insects are able to walk onwater, such as the water strider. Their legs are formed to distribute their weight. A video of a paper clip floating on water has surfaced online. The video shows the surface tension along the depression is enough to counteract the force of gravity pulling down on the metal object. This is similar in concept to wearing snowshoes to walk across deep snowdrifts without your feet sinking. Most liquids cannot maintain a stable surface tension to create a bubble, which is why soap is generally used in the process. The Marangoni effect occurs when the bubble is blown and the surface film tends to contract. This causes the pressure inside the Bubble to increase. The spherical shape of a soap bubble is caused by the minimization of the surface area - for a given volume, a sphere is always the form which has the least surface Area. In between the two surfaces is a thin film of liquid. The pressure inside a Soap Bubble can be considered by assuming no external pressure (which is, of course, not true). The total force from the surface tension (from both the inner and outer film) is, therefore, 2gamma (2pi R). Inside the bubble, however, we have a pressure p which is acting over the entire cross-section pi R2, resulting in a total Force of p(piR2). The pressure outside a bubble is zero, while the pressure inside it is two times greater than the outside pressure. In this case, the bubble's interior pressure is four times more than its exterior pressure, which is the same as the surface tension on the exterior surface. The bubble has two surfaces, one inside and one outside. The contact angle, theta, is determined as shown in the picture to the right. It can be used to determine a relationship between the liquid-solid surface tension and the Liquid-Gas Surface Tension, as follows: gamma ls = - gamma lg cos theTA where gamma Ls is theLiquid-Solid Surface tension gamma LG isLiquid Gas SurfaceTension gammaLg. If the meniscus is concave, the contact angle is less than 90 degrees, then the cos theta term is positive, in which case the relationship would result in a negative liquid-solid surface tension. What this means, essentially, is that the liquid is adhering to the walls of the container and is working to maximize the area in contact with solid surface. Caity manifests in many ways in the everyday world. When burning a candle, the melted wax rises up the wick due to capillarity. In biology, though blood is pumped throughout the body, it is this process which distributes blood in smallest blood vessels which are called, appropriately, capillaries. Place the narrow edge of the quarter in the water and let go. (This minimizes disruption to the surface, and avoids forming unnecessary waves that can cause overflow. ) As you continue with more quarters, you'll be astonished how water becomes on top of glass without overflowing. Possible Variant: Perform this experiment with identical glasses, but use different types of coins in each glass. Variant 2 Trick Place the sewing needle on a small piece of tissue paper (large enough to hold the needle). The needle is placed on thetissue paper. Variant 1 Trick Carefully pull the fork out, and it is possible to leave the Needle floating on surface of water. This trick requires a real steady hand and some practice. The tissue paper will become soaked with water and sink to the bottom of the glass, leaving the needle floating on the surface. Do not play with matches without parental approval and supervision! The air forced out by the bubble should be enough to put out the candle. Motorized Paper Fish needed materials: piece of paper scissors vegetable oil or liquid dishwasher detergent a large bowl or loaf cake pan full of water. Put a drop of the detergent or oil in the hole in fish's middle. This will cause fish to propel forward, leaving a trail of oil as it moves across the water, not stopping until oil has lowered the surface tension of entire bowl. The table below demonstrates values of surface tension obtained for different liquids at various temperatures.
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