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Liquids like honey have a higher viscosity because they contain more complex molecular structures; while water consists of simple hydrogen and oxygen bonds, honey also contains sugars." } ], "rich_title": "What is Viscosity?", "title": "What is Viscosity?" }, { "parts": [ { "image": { "_id": "sciencing.com/changing-temperature-affect-viscosity-surface-tension-liquid-16797.html", "alttext": "Close-up of pancakes stacked high with syrup being poured over them", "applicableproductofferings": [ 0 ], "aspectratio": 1, "attributionhtml": "Ciaran Griffin/Stockbyte/Getty Images", "attributionlink": "", "attributiontext": "Ciaran Griffin/Stockbyte/Getty Images", "authorizations": [], "caption": "When cold syrup is heated, it becomes less viscous and easier to pour.", "collectionname": "Stockbyte", "credit": "Ciaran Griffin/Stockbyte/Getty Images", "getty_id": "57283744", "height": 1025, "isfavorite": false, "licensetype": "RoyaltyFree", "photoguid": null, "photoid": "GettyCreative/57283744", "photosource": null, "summary": "Close-up of pancakes stacked high with syrup being poured over them", "thumbheight": 0, "thumbnail_url": "http://photos.demandstudios.com/getty/article/81/18/57283744.jpg", "thumburl": "http://cache3.asset-cache.net/xt/57283744.jpg?v=1&g=fs1|0|STK|83|744&s=1&p=1&b=NUU4", "thumbwidth": 0, "title": "Close-up of pancakes stacked high with syrup being poured over them", "unique_id": "raNrl", "url": "http://photos.demandstudios.com/getty/article/81/18/57283744.jpg", "width": 1025 }, "thumbnail": "http://photos.demandstudios.com/getty/article/81/18/57283744.jpg" }, { "content": "When a liquid heats up, its molecules become excited and begin to move. The energy of this movement is enough to overcome the forces that bind the molecules together, allowing the liquid to become more fluid and decreasing its viscosity. For example, when syrup is cold it has a high viscosity and can be difficult to pour. 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The molecules on the surface of a liquid are bound to the molecules beside and below them, but have nothing above them to balance out these attractive forces. Because of this imbalance, the molecules on the surface of the liquid will be drawn more strongly to those around it, creating a sheet of tightly bound molecules on the surface of the liquid." } ], "rich_title": "What is Surface Tension?", "title": "What is Surface Tension?" }, { "parts": [ { "content": "As the temperature of a liquid increases, its surface tension decreases. When water heats up, the movement of its molecules disrupts the imbalanced forces on the surface of the water and weakens its sheet-like barrier of tightly bound molecules, thereby lowering the surface tension. 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