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In a similar way, the particle theory suggests that small particles move past each other more easily than large particles can. Well, assuming that the grade 3’s are smaller and take up less space than the adults, it should (theoretically) be easier for the kids to get through because they can more easily fit into any empty spaces within the crowd. Would it be easier to sneak through the crowd if they were a group of grade 3 students or full-grown adults? What if a small group of friends is trying to move through a large crowd of people at the mall. However, when the sap is heated and most of the water has evaporated, the result is a thick, sweet, and flavourful syrup, irresistible on pancakes and waffles! Why Viscosity Varies The sap itself is thin, runny, and not sweet to the taste. Maple syrup comes from the sap of sugar maple trees. The candy would then have to be remade.Ĭanada’s maple syrup industry depends on controlling the viscosity of a liquid. If the cany were to stay too hot for too long, it might become so hard that it would be unpleasant to bite. Some candy coatings are especially sensitive to temperature. The coating on candy bars must be at precisely the right consistency and temperature in order to cover the bar completely with the same amount of chocolate each time. Technicians must control the viscosity of various chemicals in chemical processing plants. Mechanics must choose an engine oil that is the right viscosity for the season.Īrtists need to know how to thin or thicken oil paints or acrylics. For example, chefs need to know how to make gravies thinner than sauces and frostings thicker than icings. People in many occupations need to know how to adjust the viscosity of a substance to suit specific applications. Drug companies manufacture medicines, such as cough syrup, that have a high viscosity yet are still drinkable, in order to coat and soothe the throat. The viscosity of some medications, such as the various liquids used to remove warts, has also been modified for easier application. Now, however, the viscosity has been increased to produce an almost gel-like texture, so that the product is easier to apply and sticks well to the surface of the furniture. In the past, this thin, smelly liquid was difficult to use because it tended to run down and off the furniture before it had a chance to remove old paint and finishes. In fact, antique dealers and many householders are glad that furniture stripping liquid has finally been thickened. For example, the viscosity of paints, varnishes, and similar household products is closely regulated so that the paints and varnishes can be applied smoothly and evenly with a brush roller. ![]() Why might it be important to know how to determine the flow rate and, therefore, the viscosity of a liquid? The viscosity of liquids is an important property that must be measured precisely in some industries. What property of fluids do you think might cause a liquid to slow down? Applications of Viscosity in Liquids ![]() Just as certain variables can slow you down in a race, certain variables can also slow down the flow of fluids. This characteristic is called the fluid’s flow rate. You would measure the time it takes for the fluid to flow from one point to another (its distance). In a similar way, you could measure how fast a fluid “runs”. Which one do you think would flow to the end of a pan first? If you wanted to know how fast you could run, you might ask a friend to time how long it would take you to run, say, 100 m.
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