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Sunday, January 9, 2011

Happy New Year!

Hello everyone! I hope everyone has enjoyed a restful holiday season!

Posted by Ana at 11:22 AM

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My daughter and I at her quinceanera.

Balloon Fest 2009

Buddy, the cat.

Sunset on the Franklin Mountains

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The purpose of this investigation is to find which materials slow down the cooling process. For the investigation on heat transfer, I chose to test aluminum foil, plastic wrap, wax paper, and a paper towel. I poured 150 mL of boiling (100 degrees Celsius) water into 8 oz styrofoam cups. I covered each cup with the a 13 cm by 13 cm square of each of the materials and secured them with a rubber band. I then let the cups sit on a counter for 30 minutes. After 30 minutes I checked the temperature of water in each of the cups. The results are in the table below: Material 13 by 13 cm squre Aluminum Foil Wax Paper Paper Towel Plastic Wrap Temperature In °C, after 30 minutes. 48°C 44°C 42°C 46°C This investigation covered heat transfer through two methods, first it was through evaporation and radiation. The aluminum foil is the least porous of the materials, therefore it had the least evaporation of the water and cooled at a slower rate. Aluminum foil also has a reflective surface and reflects the heat energy back to the water in the cup, rather than letting the heat escape. If I were to repeat the investigation with different materials, I would probably use different thicknesses of cloth. The cloth with the biggest thickness would probably keep the most heat because it is the one that would allow the least evaporation. This investigation could be done with other items that are not water. I would love to retry this investigation with a non-liquid like uncooked beans, or lentils. I would heat the beans and place them in cups and cover them with various materials. Since beans do not contain much liquid that would evaporate and speed up the cooling process, the temperatures might vary. * What, specifically, would you like students to learn from this experiment? Did you achieve this goal when you engaged in the experiment?

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Science Rules!

Sunday, January 9, 2011

Happy New Year!

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