blood splatter analysis

Blood splatter lab lesson

Height/cm	Diameter of A/mm	Diameter of B/mm	Average Diameter/mm
10	9	9	9
30	11	11	11
60	13	13	13
100	16	15	15.5
150	15	15	15

The greater the height from which the drop of blood is dripped, the larger the average diameter of the splatter.

Angle tilted by board/o	Angle of impact	Width (P)/mm	Width (Q)/mm	Average Width/mm	Length (P)/mm	Length (Q)/mm	Average Length/mm	Theoretical Angle of Impact
10	80	11	13	12	11	13	12	90.0
30	60	13	13	13	14	15	14.5	63.7
50	40	12	11	11.5	17	28	22.5	30.7
70	20	8	7	7.5	35	45	40	10.8

The greater the angle of impact, the greater the theoretical angle of impact.

Thanks to my lab patner Jia Min for doing up the table :)

How were these splatters formed?

Near to the surface. If it were to be far away, then the splatter would be rounder.

From a distance. And for multiple times at the same spot, causing some droplets to splatter at the sides.

At an angle. The direction the tail is going towards is the direction the splatter was....splattered. In this case, it would be from right to left, unless the photo was tilted or turned.

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https://www.facebook.com/media/set/?set=a.2199013384650.2126645.1526743123&type=1

The link to photos on finger printing lab lesson :)