Pdf analysis of kinematic viscosity for liquids by. To directly measure the viscosity and density of selected liquids. To demonstrate the principles of poiseuilles law and stokes law. However, different liquids do exhibit different viscosities, and macromolecules are on the highviscosity end of the spectrum. The air temperature can effect the results as liquids such as honey tend to harden when the air temperature is cooler which means the viscosity will be different. Viscosity tells us the resistance of a fluid on which a force is acting.
Viscosity is the single most important physical property governing the production, transport and eruption of magmas papale, 1999, sparks, 2004, dingwell, 2006. Jan 12, 2020 this easy viscosity experiment looks at different liquids from around the house and compares them to each other. Experimental equipment to develop teaching of the concept viscosity. The effect of pressure and temperature on the viscosity of gases is illustrated in fig. Viscosity stokes law viscosity is a property of uids liquids and gases which determines how much resistance is experienced by an object trying to move through the uid. The accuracy of measurements of viscosity of liquids. Most of the refrigerants have a liquid phase dynamic viscosity below 1 cp and the refrigerant under consideration in the present study r718 has a dynamic viscosity of 0. The viscosity of liquid is a resistance to flow of a liquid. Skills guided inquiry, interpreting data, observational skills, properties of liquids, reading tables, science experiment to try, viscosity. The objective of this experiment is to demonstrate the principles of poiseuilles law and stokes law, to directly measure the viscosity and density of selected liquids, as well as to show how temperature affects the viscosity of fluids. Add colorful little hearts to really get a good look at what viscosity is all about. Viscosity 5 viscosity coefficients viscosity coefficients can be defined in two ways. In everyday terms and for fluids only, viscosity is thickness. The goal of this experiment was to determine the viscosity of given liquids.
Viscosity of liquids victoria kulczak lab partners. The viscosity of naturallyoccurring silicate magmas can span more than 15 orders of magnitude 10. Temperature and pressure dependence of the viscosity of. Capillary method, using capillary viscometer and flow cup. The experiment is designed to yield reliable viscosity values by. Highly viscous liquids, like motor oil or molasses, take much longer to flow from their container than a relatively low viscosity liquid, like benzene or diethyl ether. Simple viscosity experiment for kids little bins for. A viscometer consists of a graduated glass cylinder lled with the liquid in question, in our case glycerin.
Greek letter eta is normally given in millipascalseconds mpas and is usually determined by using a rotary viscometer. Calculate the viscosity of the fluid using the following equation, where g is acceleration due to gravity 981 cms 2. A weight, w, is used to drive a rotor that is partially submerged in a sample of liquid. Theory, estimation, experiment, and data on free shipping on qualified orders. Watch the detailed viscosity of liquids science experiment step by step instructions video. The dynamic viscosity describes the flow behavior of liquids. This experiment has many steps, but when followed correctly, they will allow you to calculate the viscosity of any liquid. The word viscous comes from the latin word viscum, meaning sticky. Dynamic viscosity, also absolute viscosity, the more usual one typical units pas, poise, p. A good survey of the viscosity data, its critical evaluation and correlation would help design engineers, scientists and technologists in their areas of interest.
All liquids appear resistance to flow change from liquid to another, the water faster flow than glycerin, subsequently the viscosity of water less than glycerin at same temperature. One of the c oauthors, professor viswanath, coauthored a book jointly with dr. Of all the fundamental properties of a fluid, viscosity has the most influence on engineering behavior. Drop one marble at a time and observe what happens to the.
In this experiment, the viscosity of various liquids are compared. Explore the effects of different densities and learn about refraction, viscosity and the planet jupiter. Viscosity can be not only a fluids resistance to flow but also a gas resistance to flow, change shape or movement. Theory, estimation, experiment, and data this book is unique in that it brings together published viscosity data. The viscosity decreases with an increase in temperature. As is well known, the viscosity of gases and its variation with temperature has received a satisfactory explanation on the basis of molecular theory. The amount of liquid and the size of the marbles can effect the timing of the experiment as the heavier the marble is, the faster the time will be. Two different methods were employed, the first measures time of flow of several methanolwater solutions, from point a to. Properties of liquids worksheet the homeschool scientist. This is also a great opportunity to practice drawing and using tables, as well as making predictions beforehand. For more accurate values of viscosity wall effect need to taken into account.
Liquids can be described by their properties of color, texture and viscosity. Theory, estimation, experiment, and data by dabir s. In the mks system the unit of viscosity is nsm2 whereas in the cgs system the unit of viscosity is the poise 1 poise 1dyneseccm2. To quantify viscosity, we will imagine our bulk fluid as consisting of a number of very.
The viscosity effect can be observed through in laminar couette flow. Weve done viscosity experiments before by letting the liquids flow down an inclined board. Nicole gonzalezsitja introduction the objective of this experiment is to demonstrate the principles of poiseuilles law and stokes law, to directly measure the viscosity and density of selected liquids, as well as to show how temperature affects the viscosity of fluids. D s viswanath brings together viscosity data, experimental methods, theoretical, and correlation and predictive procedures. Simple viscosity experiment for kids little bins for little.
The viscosity of liquids ubc open collections university of. For fluids, it basically refers to how thick a fluid is. Apr 23, 2012 viscosity races making science fun for kids says. Viscosity of liquids theory, estimation, experiment, and. The opposite of viscosity is fluidity which measures the ease of flow while liquids such as motor oil or honey which are sluggish and high in viscosity are known as viscous. Experiment 1 viscosity measurement purpose the purpose of this experiment is to measure the viscosity of a glycerinwater mixture with a thomasstormer viscometer. Greek letter eta is normally given in millipascalseconds mpas and. A good survey of the viscosity data, its critical evaluation and correlation would help design engineers, scientists and. Viscosity is not a phenomenon limited to macromolecules. The purpose of this experiment is to determine the viscosity with varying temperature of the liquids.
Viscosity of liquids theory, estimation, experiment, and data. Natarajan data book on the viscosity of liquids in 1989 which mainly presented collected and evaluated liquid viscosity data from the literature. Small metallic spheres are dropped in to the liquid from the top. Among the properties of liquids the viscosity is probably the one the investigation of which has suffered most from lack of any accepted theory, however crude and approximate, to guide it. The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow.
Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or tensile stress. Have a viscosity race, using different liquids down a board. Handbooks commonly quote viscosity in centipoise 1 cp 0. To calculate viscosity of a liquid, you will need a sphere, a graduated cylinder, a ruler, a stopwatch, the liquid in question, a scale, and a calculator. Gt viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or tensile stress. In this experiment, a rectangular portion of a fluid i.
Viscosity races investigating the flow of liquids experiment. For most liquids, including hydrogen bonded, weakly associated or unassociated, and polymeric liquids as well as liquid metals. The dimensions of viscosity are force per unit area divided by velocity gradient as in eq. Another method of measuring the viscosity of a fluid is the rotating viscometer. Viscosity occurs as a result of contact liquid layers with each other. Step 1 gather four clear glass jars and fill one with water, one with corn syrup, one with cooking oil and one with honey. A redwood viscometer is used to measure the flow of eight different liquids including engine oil, sunflower oil, soybean oil, glycerol, thermic fluid hytherm, coconut oil, water and ghee. For accuracy, have students repeat the experiment and calculate an. In this viscosity experiment we attempt to refine the procedure by comparing fluids by dropping a marble through them. We can see and feel the viscosity of a liquid when we watch it flow or try to stir it. The common practice is to calibrate viscometers by a stepup technique, using a series of instruments and test fluids, based on the viscosity of water. Determination of the kinematic viscosity by the liquid rise in.
The liquid viscosity is highly affected by the heat. Drop one marble at a time and observe what happens to the marble when it enters the liquid. Nov 05, 20 liquids can be described by their properties of color, texture and viscosity. The accuracy of measurements of viscosity of liquids nvlpubsnist. Temperaturedependent density and viscosity of the ionic liquids 1alkyl3methylimidazolium iodides. Sep 20, 2019 gather the necessary materials for the experiment. To quantify viscosity, we will imagine our bulk fluid as. Theory, estimation, experiment, and data this book is unique in that it brings together published viscosity data, experimental methods, theoretical.
For comparison, the viscosity of water is approximately 1 mpas. Texture liquids can feel sticky, gooey, slippery, or watery to the touch. Using a photogated digital time interval measuring clock, acrylic spheres dropped in a vertical tube filled with castor oil such that they move through the oil under gravity, the viscosity of the oil is determined by applying the stokes law. Pdf analysis of kinematic viscosity for liquids by varying. The concept of viscosity is wellknown in everyday experience, liquids with low viscosity such as water are said to be thin, on the other hand. The need for properties is ever increasing to make processes more economical. Most liquids suffer the exponential relationship seeton, 2006 between temperature and viscosity rather than linear form fig. A group contribution method to estimate the viscosity of ionic liquids at different temperatures. It is defined as the internal frictional resistance of a liquid to the application of a pressure or a shearing stress. Viscosity is a tensorial quantity that can be decomposed in different ways into two independent components. Supplies needed 4 clear glass jars of the same size we used pint sized mason jars 4 marbles read more. The experiment is a simple way to explain and measure the viscosity of a liquid. Prediction of ionic liquids viscosity at variable temperatures and pressures. After falling su ciently the spheres acquire terminal velocity.
Since this was planned as an experiment to assess systematic errors rather. I used golden syrup, dishwashing liquid, water, alcohol and vegetable oil. Although it is one of its kinds in the field, prof. This book provides an understanding of why various methods are used for measuring. Oct 09, 20 weve done viscosity experiments before by letting the liquids flow down an inclined board. In fact, liquids do not really exhibit the noviscosity case outlined above, because the molecules do interact with each other. Viscosity is a property of a liquid and is defined as the resistance of a liquid to flow. Some liquids seem thin, while others seem thick this property of liquids is called viscosity. For this experiment, we are going to test how marbles behave differently based on the type of liquid they are dropped into. The more viscous the fluid, the more sensitive it is to the temperature change.
Viscosity races investigating the flow of liquids experiment how to test viscosity of liquids what you need ketchup, mustard, molasses, corn syrup, and spaghetti sauce, honey, bbq or. Viscosity, resistance of a fluid liquid or gas to a change in shape, or movement of neighbouring portions relative to one another. One may ask the question of what is actually going on in the liquids to make one. In this science worksheet, your child learns about the relative viscosity of everyday liquids. In this experiment we will use stokes law and the concept of terminal velocity to determine the viscosity of glycerin. In the metric system, the unit of viscosity is the poise 1 p 1 g cm1 s1, which is subdivided to 100 centipoise cp. Heres a fun experiment you can try using the contents of your kitchen cupboard. Ce 320a lab 1 lab experiment 1 viscosity of liquids objectives. Viscosity describes a fluids internal resistance to flow and may be thought of as. The final experiment had possible errors due to the experimental setup. Dec 03, 2017 viscosity races investigating the flow of liquids experiment how to test viscosity of liquids what you need ketchup, mustard, molasses, corn syrup, and spaghetti sauce, honey, bbq or any other.