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To investigate the viscosity of different concentrations of wallpaper paste and how it delays the fall of an object through a liquid.

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Introduction

Viscosity Aim: To investigate the viscosity of different concentrations of wallpaper paste and how it delays the fall of an object through a liquid. Simple Plan: I am going to take five measuring cylinders each with different concentrations of paste and place a rolled up ball of blue-tack in each measuring cylinder. I intend to time the fall of the marble through the wallpaper paste. With the results I shall attempt to find a pattern and draw an accurate conclusion. Equipment: * 5 100ml measuring cylinders (for the wallpaper paste) * 5 100100ml measuring cylinders (for the water) * 5 100ml beaker * Stopwatch * Piece of card * Glass rod * A ball of blue-tack * Solutions: Wallpaper Paste (ml) Water (ml) Solution 1: 100 0 Solution 2: 80 20 Solution 3: 60 40 Solution 4: 40 60 Solution 5: 20 80 Preliminary Work: * I have found from research, that heavy, dense liquids are more viscous. * Viscosity is measured in centipoises (cp) or millipascal- seconds. The formula for density is "K= �/ density" Kinematical Viscosity is measured in centistokes (cSt) * I have decided to use a stopwatch, which measures in seconds. Viscosity Viscosity is the measure of how easily a substance will flow. Therefore some substances are more viscous then others, because they are much thicker and therefore flow a lot slower, for example water will flow quicker then honey because it isn't as thick. ...read more.

Middle

The solutions will be labelled, 100% Wallpaper paste, 80% Wallpaper paste, 60% Wallpaper paste, 40% Wallpaper paste, 20% Wallpaper paste and 0% Wallpaper paste. Place a piece of card over each cylinder and on top place the blue-tack ball. 3. Make sure the stopwatch is ready. 4. Pull the card from over the cylinder; this will release the blue-tack ball into the solution. At the same time, however, start the stopwatch. 5. Stop the stopwatch once the ball reaches the surface of the cylinder. 6. Carry out this procedure until the results have been taken down for all 5 of the solutions. 7. Repeat the experiment 3 times so that any anomalies will stand out. Prediction: I predict that the solutions that are more viscous for example the solutions that are 100%, 80% and 60% wallpaper paste will take more time to reach the surface of the cylinder. The reason being viscosity is the resistance of a fluid to flow. Diluting or heating the solution can alter the viscosity of a fluid. In this experiment the solutions have been diluted and so therefore the more diluted solutions such as the solutions, which are 40%, 20% and 0% wallpaper paste will reach the surface of the measuring cylinder much faster then the more concentrated viscous solutions. ...read more.

Conclusion

Nevertheless, there is always room for improvements; such as I could have used a digital stopwatch to time the reaction as a digital stopwatch measures the time in seconds up to two digital places (0.00 seconds) This would automatically improve the accuracy of the results. Also I could have used the same measuring cylinder for each experiment, only that I would have to rinse and make sure it is dry thoroughly before carrying out the experiment. Although there is room for minor adjustments, the results seem accurate and reliable because they follow the same pattern. Thus I believe they support my prediction and collusion as both show that the more viscous the substance the less easily an object will fall through it. Also they both show that the wallpaper paste is more viscous than water, because when the solution was 100% wallpaper paste, the average time it took for the blue-tack ball to fall through was 63.3 seconds, however with 100% water the average result was 0.4 seconds. Therefore the wallpaper paste was much more viscous than water. To further prove my conclusions, I could conduct the experiment, investigating the concentration, however keeping the concentration the same, but changing the temperature of the wallpaper paste solution, to show that by y increasing the temperature, viscosity of the liquid decreases. This would reduce human error, as observing the rate at which the blue-tack ball falls and reaches the surface depends upon the observer. ...read more.

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