CSI: Blood Splatter Part 2

Here is our group's video!

CSI: Blood Splatter Experiment Results

We did an experiment whereby we had to drop drops of fake blood from a retort stand at different angles and heights. Here is the results for the different heights dropped:


Distance from paper / cm          Average diameter/cm      
10                                                     0.85
30                                                     1.1
60                                                     1.25
100                                                   1.35
150                                                   1.4

Graph of above results

Here are the results for the angle of elevation:


Angle of elevation / °         Average length/cm
70                                          2.4
50                                          1.9
30                                          1.55
10                                          1.35


Angle of elevation / °           Average width/cm
70                                         0.75
50                                         1.15
30                                         1.25
10                                         1.6

CSI Blood Splatter Practical

Blood Splatter Pattern from a Laboratory Experiment by Mr Leong TK & Chua HL

Questions:

1. What is shape of blood splatter?
2. Describe any other characteristic of the splatter.
3. What are the factors that affect the shape of the blood splatter? Name as many as possible.
4. Generate some hypotheses from the blood splatter patterns observed above.

1. The shape of the blood splatter is circular with jagged edges, but becomes more and more elongated as the angle of elevation increases.

2. The blood drop is concentrated in the middle and has an irregular, less concentrated fringe. This is because the blood spreads and divides into 2 distinct layers.

3. Height, velocity, angle at which it was dropped, direction, nature of instrument which caused the blood splatter

4. The greater the angle of elevation, the more elongated the blood splatter.