Penny Lab

Gabbeh Parente D
September 21, 2010
Penny lab
Problem:
Does the issuing of drops of liquid a penny can hold depend on the pillowcase of liquid being used?
Materials:
* Beaker of water.
* Eye eye dropper
* Penny
* Petri dish
* Paper towels
* deep brown milk
Pre-lab:
Independent variable: water
Dependent variable: deep brown Milk
guess: If the type of liquid changes (from water to chocolate milk) then the outlet of drops to cope with the penny will decrease.
Procedure:
* Determine the number of drops of water it takes to take up a penny, holding the eye dropper 2 cm. from the penny.
* Dry the penny and retest x4
* Determine the number of drops of Chocolate milk it takes to fill a penny, holding the eye dropped 2 cm. from the penny.
* Dry the penny and retest x4.
* Calculate info.
Data:

Diagram:

coda:
The conclusion I came to was my hypothesis was correct.



The number of water drops it took to fill the face og a penny was greater than the number of chocolate milk drops. For the water tests the average amount of water it took to fill the penny is 23 drops, but for the milk tests the average was 21.75. The data in the chart above shows that the number of drops went down by 1.25 when the liquid was changed from water to milk. Further testing may be needed.
Sources of error:
The main source of error in this test was the human error. Our group found it was difficult to keep our transfer at the height of 2 cm, which is a variable that we couldnt control nor keep track of. Also without knowing soul could bump the table, move the Petri dish or in few way caused the liquid on the penny to spill out front it overflowed.If you want to get a full essay, order it on our website: Ordercustompaper.com



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