26 Jun Diameter of a bloodstain produced by a single drop of blood of a constant volume is a function of distance fallen and surface texture.
Order Instructions
Relationship Between the Distance
Diameter of a bloodstain produced by a single drop of blood of a constant volume is a function of distance fallen and surface texture.
The objective of this exercise is to determine the relationship between the distance a single drop of blood of a constant volume falls and the diameter of the resultant bloodstains on various horizontal surfaces.
Equipment required
A few drops of synthetic blood
Cardboard target surface
Fabric target surface
Glass target surface
Glass pipette or dropper
Graph papers
Plumb line
Tape measure
Tissues
Digital Camera/Cell phone will work
USB Microscope/Good magnifying class will work
Procedure
Place the cardboard, fabric, and glass on the floor. You will use these three materials as target surfaces for this experiment.
Draw well- synthetic blood into the pipette or dropper, and wipe off the excess blood on the tip of the pipette with a tissue.
Squeeze the initial drop onto tissue to remove any air bubbles.
Using the plumb line for centering and a tape measure for accurate distances, allow a drop of blood to fall onto the target surfaces at the heights 3, 6, 9, 12, 18, 24, 36, 48, 72, and 96 inches.
Mark each target for proper identification.
When the bloodstains have dried, take photographs of the bloodstains, view under magnification, and measure the diameters with a ruler.
Record the results on the worksheet provided.
Plot the diameters of the bloodstain on the cardboard, fabric, and glass targets vs. the total distance fallen on a graph paper. On the x-axis, plot the height; and on the y-axis, plot the diameter.
Assignment Template
Submission Details:
For this assignment, make sure you post your initial response to the Discussion Area by the due date assigned.
To support your work, use your course and text readings and also use outside sources. As in all assignments, cite your sources in your work and provide references for the citations in APA format.
Start reviewing and responding to the postings of your classmates as early in the week as possible. Respond to at least two of your classmates. Participate in the discussion by asking a question, providing a statement of clarification, providing a point of view with a rationale, challenging an aspect of the discussion, or indicating a relationship between two or more lines of reasoning in the discussion. Complete your participation for this assignment by the end of the week.
