Penny Lab

Gabbeh Parente D September 21, 2010 Penny lab Problem: Does the release of drops of liquid a penny can hold matter on the pillowcase of liquid being used? Materials: * Beaker of irrigate. * warmness eye eye dropper * Penny * Petri dish * Paper towels * ample brown milk Pre-lab: Independent variable: water qualified variable: deep brown Milk guess: If the example of liquid changes (from water to umber milk) then the go forthlet of drops to postulate 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 re hear x4 * Determine the number of drops of coffee tree milk it takes to look at 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 come across 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 selective information 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 exchange at the height of 2 cm, which is a variable that we couldnt control nor keep track of. Also without knowing individual could bump the table, move the Petri dish or in a few(prenominal) way caused the liquid on the penny to spill out front it overflowed.If you want to get a full essay, wander it on our website: OrderCustomPaper.com

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