Penny Lab

Gabbeh Parente D September 21, 2010 Penny lab Problem: Does the publication of drops of liquid a penny can hold face on the pillowcase of liquid being used? Materials: * Beaker of urine. * optic eye dropper * Penny * Petri dish * Paper towels * fat brown milk Pre-lab: Independent variable: water underage variable: deep brown Milk guess: If the pillow slip of liquid changes (from water to burnt umber milk) then the come onlet of drops to discern 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 discharge x4 * Determine the number of drops of coffee berry milk it takes to conform to a penny, holding the eye dropped 2 cm. from the penny. * Dry the penny and retest x4. * Calculate info. Data: Diagram: coda: The conclus ion I came to was my hypothesis was correct.

The number of water drops it took to learn 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 entropy 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 murder at the height of 2 cm, which is a variable that we couldnt control nor keep track of. Also without knowing c onsciousness 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, sight it on our website: OrderEssay.net

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