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Blood Drops
Describe the relationship between drop height and drop
diameter.
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+Introduction - Procedure
1. Hold the dropper upside down in a vertical position 15 cm
from the target surface.
2. Squeeze the bottle to release one drop that lands on the
index card.
3. Mark the card as 15cm.
4. Repeat this process for heights of 30cm, 45cm, 60cm, 75cm,
100cm and 150cm.
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+Introduction – Data Table Create the data table below in your
science journal. (right page)
Height of Blood Drop (cm)
Diameter of Blood Drop (mm)
Sketch of Blood Drop
15 cm
30cm
45cm
60cm
75cm
100cm
150cm
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+Measuring Diameter of Blood Drop
1. Open the jaws of the calipers so that they match the outside
edge of the drop.
2. Use the OUTSIDE measurement arm of the caliper. We are going
to round to the nearest mm in this lab.
3. Use the 0 (zero) in the upper portion to determine how many
mm your diameter is. Rounding is OK today.
Using Calipers Calipers
How many mm?
0 is between 15 and 16, round to nearest mark.
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Gathering and Measuring your Data
Use the pictures of blood droplets and calipers to record
measurements onto your data table in your journal.
Pictures are not to scale, they are zoomed in to see detail.
Draw the general shape of each droplet in your data table.
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+15 cm drop height
Record the measurement Reading in your data Table.
Remember to sketch the Shape of your drop in Your data
table.
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+30 cm drop height
Record the measurement Reading in your data Table.
Remember to sketch the Shape of your drop in Your data
table.
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+45 cm drop height
Record the measurement Reading in your data Table.
Remember to sketch the Shape of your drop in Your data
table.
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+60 cm drop height
Record the measurement Reading in your data Table.
Remember to sketch the Shape of your drop in Your data
table.
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+75 cm drop height
Record the measurement Reading in your data Table.
Remember to sketch the Shape of your drop in Your data
table.
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+100 cm drop height
Record the measurement Reading in your data Table.
Remember to sketch the Shape of your drop in Your data
table.
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+150 cm drop height
Record the measurement Reading in your data Table.
Remember to sketch the Shape of your drop in Your data
table.
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+Wrap-up and Analysis
1. Create a graph showing the relationship between the height
of the drop and the diameter of the drop.
Remember the following when graphing!
a. USE A RULER! I want straight lines
b. Keep your scale consistant – if one box = 10 cm when you
start, it should = 10 cm when you finish!
c. Label axis and include a title (your title is not one word
or a phrase – a sentence is best!)
