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# Comparing the density of skimmed milk and homogenised milk

Extracts from this document...

Introduction

 2 23.48 -2.42 5.86 3 31.22 -4.68 21.9 4 32.72 -3.18 10.11 5 41.23 5.33 28.41 Mean = 35.9 90.78 Homogenised milk 1 23.55

Middle

-2.666

7.1

5

27.96

2.954

8.73

Mean =

25.006

38.1

SD=

## Analysing

From performing the experiment I have found that skimmed milk is less dense then homogenised milk. I say this because from the results I have obtained show that the 5 drops of skimmed milk that I released into the 100ml measuring cylinder fell to the 10ml mark at about 10 seconds slower than the 5 homogenised milk drops. So this suggests that homogenised milk is denser the skimmed milk.

My initial thoughts when doing the experiment was that I thought that the homogenised milk would be the denser out of the two as it contained a lot more fat and from performing the experiment I found that this was the case and that the homogenised milk was the most dense. So I have come to the conclusion that it is the fat in the milk that makes it dense. This is proven in my results as the skimmed milk dropped to the 10ml mark slower because it contains more proteins, which are lighter making the drop fall slower, than the homogenised milk which has more fats, as these are heavier and make the drop fall faster.

Conclusion

• Using a computer to do the timing, as this would be a lot more accurate as there wouldn’t be human error affecting the result.
• I could also try semi-skimmed milk, if I was going to take this experiment in to more detail, to see if the results from that followed my conclusion and this would also give me more evidence to support my conclusion. I would expect the drops of semi skimmed milk to drop slower than homogenised milk but quicker than skimmed milk. As it has more proteins than homogenised milk but more fats than skimmed milk.
• I could have expanded my experiment by finding out if the size of the drops made a difference, as this would again add more evidence to support my conclusion.

It is important to clear all of these problems in the experiment as they reduce the accuracy and the reliability of my results that obtained, but the main change I would make would be to have more time so I could keep repeating the drops until I got 5 of the same size so that it was a fair test. However still I believe the results I got from the experiment support my conclusion but they still need to be improved.

This student written piece of work is one of many that can be found in our GCSE Forces and Motion section.

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