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CHE113SER8 - around the edge of the blood droplets –...

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CHE113 Forensic Science Nicolas Canel Forensic Serology Passive Bloodstains - Passive Bloodstains are drops created or formed solely by the force of gravity. - Can be subdivided into drops, drip patterns, pools, and clots. Terminal Velocity v Distance Fallen Surface Bloodstains (Passive) - Bloodstains can occur on a variety of surfaces including clothing, carpeting, walls, etc. - The type of surface the blood strikes affects the nature of the observed splatter pattern. Blood droplets that strike a hard smooth surface (e.g., glass) will have little distortion around the edges of the droplet. Blood droplets that strike linoleum flooring will often show distortion (scalloping)
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Unformatted text preview: around the edge of the blood droplets. – Blood droplets striking wood or concrete are distorted to a larger extent (e.g., spines and secondary splatter). Dripping Blood-Blood trickles downwards-Blood drop grows until Wt (G) > S.T.-Single drop breaks free (teardrop shape)-Surface tension pulls in vertically-And horizontally-Shape settles into sphere (0.05 ml) -Does not break up until impact Height Fallen-Single drops of blood falling from fingertip onto smooth cardboard from various heights.-No change in diameter beyond 7 ft....
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