Wednesday, April 2, 2008

activity 4

Today in class we had to measure the temperature of water in a clear pop bottle that was sealed off with tape so that the room air couldn't get in. we taped a thermometer into the bottle and wrote down the temp. every minute for 20 minutes. Everyone in the class had a different type of soil or just water in their bottles and they had a different kind of bottle. there were some that were painted on the top to symbol clouds in a sky and some like ours were clear to symbol no clouds. We all had a lamp that was 6 inches away from the bottle to symbol the heat.we saw that our temp. went up and would stay there for a couple of minutes and then it would go up another point and then stay there and the process continued until the end where it stayed the same and the last one. this shows that when there isn't clouds in the sky there is more direct sunlight on the earth making the water that is n the land evaporate.Evaporation is the process by which molecules in a liquid state (water) spontaneously become gaseous water vapor.
When you are in a drought the temperatures are usually higher than normal. The severity of the drought depends upon the degree of moisture, duration and the size of the affected area.


(1)http://en.wikipedia.org/wiki/Evaporation
(2)http://www.42explore2.com/drought.htm

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