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FSC239Y5 Lecture Notes - Viscosity

Forensic Science
Course Code
Joel Cahn

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Bloodstain Pattern Analysis (BPA)
Guest Speaker: Constable from Niagra Police Force
- Study of size and location of bloodstains, to determine physical events which gave rise to
their origin.
- Genesis = chapter 4
- Magna carta (Jamanic Law)
- 1936: Charlie Chan
- 1939: Balthazard – a research paper before WWIII
- 1971 – first published textbook (forensics)
- 1983: International Association of Bloodstain Pattern Analysis
- Blood: connective tissue that consists of cells suspended in a liquid matrix.
oAverage adult has 5 litres of blood (over 5 quarts) of continuously circulating
oSolid in blood: white/red blood cells and platelets
oSerum – plasma (90% H2O)
oBlood – 49.5% is water
- Surface Tension:
oProperty that results of the cohesive forces between the molecules of the liquid
- Viscosity
oFluids lack the ability to support a shearing stress (can be poured) ; very viscous
fluids have a high coefficient of viscosity. Viscosity can change with temperature.
- Droplet Osscilation
oInternal movements or deformations within the sphere of fluid in free flight relate
to oscillations.
oCyclic to cause a range of ecurring deformations from the perfect sphere.
oThis results in a somewhat evenly distributed shape deformation.
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