• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6
7. 7
7

# Viscosity Experiment. The aim of my investigation will be to analyse the relationship between several variables, which are defined by stokes law, and conclusively to apply these in order, to calculate the viscosity of the fluid from my results.

Extracts from this document...

Introduction

The aim of my investigation will be to analyse the relationship between several variables, which are defined by stokes law, and conclusively to apply these in order, to calculate the viscosity of the fluid from my results. To see how successful my experiment was, I will be comparing my results with those from external sources such as a Textbook; this would therefore determine how accurate my experimental results were.

All fluids, from liquids to gases illustrate the property of viscosity to some degree. Viscosity is caused by internal friction due to the strong intermolecular forces; hence it is affected by temperature in liquids. It is measured in Pascal’s per second unless the viscosity is kinematic. Viscosity can be thought of as fluid friction, just as friction between two solids resist the motion of one over the other, also possible to cause an acceleration of one fluid relative to the other.

Liquids will vary from “thin” having a lower viscosity like water, to “thick” having much higher viscosity like honey or treacle. There are many ways to measure viscosity, for example “the line spread test”, which involves a fixed quantity of liquid being allowed to flow out of a container and spread onto a flat surface or “redwood viscometer”, which involves the liquid to flow through a narrow tube driven by its

Middle

I firstly filled three 100ml3 measuring cylinders with Golden syrup, half an hour in advance, so that air bubbles trapped and other uneven surfaces in the fluid can even out, this will prevent any eddies or turbulence while the ball bearing is falling through the cylinder. The test tubes were placed in water baths, 1st cylinder was placed in a water bath, having a temperature of 35oc and the second cylinder was placed in a water bath, having a temperature of 45oc and the third cylinder was the control which was exactly 25oC. The Cylinders had to be left in the water bath until it usually maintained an approximate constant temperature.

I had to be cautious when reading of the thermometer as there is always a possibility of parallax errors. I had to also make sure that I read of the thermometer from eye level, as this prevented parallax errors and reduced inaccuracy in the experiment. The scale of the thermometer went up 1 degree at a time; the scale did not affect my experiment because all my measurements were all Whole numbers, but if they were between two degrees the scale of the thermometer would have been inconvenient.

The next step involved me placing a big white piece of paper behind each cylinder as an ordinary backdrop, this will enable me to identify the ball easier and distinguish while it is falling.

Conclusion

>

Results for experiment showing “How different size ball bearings affect the Viscosity of the Fluid?”

 Ball Bearings -> Small Medium Large 1 41.66 50.09 66.78 2 42.36 49.89 64.89 3 39.7 51.9 67.12 Average 41.24 50.62667 66.26333

Below I have shown the graph, for “the effect on temperature on Viscosity”

The above graph shows a strong negative correlation, the increase in temperature shows the decrease in time. From this graph I can say that this graph is inversely proportional. From these results I am also able to construct a distance- time graph. The gradient of the graph will show the velocity of the ball.

It was necessary to repeat readings, because this would keep my experiment reliable and accurate. I however did not have any odd results, if I was to have any outliers in my results, it would be most likely to be activating and deactivating the stopwatch. The ranges of results were within 1 degree of each other results.

Independent and Dependant Variables

The variables that I will have to keep constant in my first experiment (temperature effect on viscosity). I will be keep the temperature as the dependant variable and keep all other variables as the independent variables, for example the size of the ball bearing, the same liquid and the same atmosphere. All my variables will be kept constant, the same ball bearing will be used each time, and I will have to use a magnet to take out my ball bearing from the fluid, and then be washed under cold water and then dried on a paper towel. This will keep my experiment fair.

This student written piece of work is one of many that can be found in our AS and A Level Fields & Forces section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Fields & Forces essays

1. ## paper cones investigation

5 star(s)

and could easily be reduced by the use of a fixed electromagnetic release. By this method the uncertainty in the measurement of drop distance could be reduced to the resolution of the metre rule used (�0.5mm).

2. ## Investigating the forces acting on a trolley on a ramp

5 star(s)

experiment were recorded in a table with two columns; distance from light gate measured in millimetres and time taken to pass through the light gate, measured in milliseconds. Without taking friction into account, it was possible to take a rough estimate of acceleration due to gravity and hence it was

1. ## Determination of the acceleration due to gravity (g)

4 star(s)

I can find out the g by calculating the gradient of the line. Gradient of the line(g) = velocity / time g = ?V / ? t = 1.16-0.4 / 0.25-0.1 = 5.07 ms-2 There is a big difference between the actual value 9.18 ms-2 and the measured value 5.07 ms-2 .

2. ## Investigating the relationship of projectile range and projectile motion using a ski jump.

However it didn't show that the y-component is directly proportional to the x-component. This could be of the inaccuracy of the equipment, measurement and air resistance when in travelling in the air and friction on the ramp. The accuracy of the meter ruler is quite poor when it comes to measuring the point at which the ball has landed.

1. ## The aim of my investigation was to explore the viscosity of golden syrup using ...

I coated my bearing in golden syrup before dropping it in as this would reduce friction as the ball hit the golden syrup. These are the results I gathered from my dropping. Ball Radius 1 2 3 4 5 6 7 8 9 10 'Medium'5.955mm 23.28s 22.18s 22.41s 22.28s 21.53s

2. ## Investigation to determine the viscosity of glycerol.

In liquids the molecules flow in layers. See the right - water flowing from a jug, it looks simple, but in reality it is quite complex. Actually only the top layer of water is flowing, the bottom layer is still. This is explained with the help of the diagram on the left.

1. ## Measuring The Constant g; The Acceleration Due To Gravity

- 0.4 9 - 0.37 9.73 - 0.36 10 - 0.35 10.28 4 0.45 8.88 - 0.44 9.09 - 0.42 9.52 - 0.4 10 - 0.41 9.76 4.4 0.48 9.17 - 0.44 10 - 0.46 9.57 - 0.49 8.98 - 0.44 10 4.8 0.49 9.8 - 0.5 9.6 - 0.54

2. ## Stopping distance Investigation.

I will decrease the starting distance by 1cm each time, going down from an original distance of 14cm to a final distance of 7cm. Overall, I will repeat this experiment 8 times, each time decreasing the starting distance. EQUIPMENT: To conduct these investigations I will need: 3 trolleys Ramp Tub (to balance the ramp on)

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to