In this fourth-grade science project, a student had to research the procedure for constructing a barometer, build the barometer, record barometric pressure readings, and correlate the readings with precipitation. The student was then able to predict weather. Commentary The Sample: •shows the student can apply various skills used in meteorology (e.g., mathematical, scientific) •demonstrates the student’s ability to read, interpret directions, and build a scientific instrument •illustrates the student’s ability to graph, record, and interpret data •shows the student’s ability to conduct research. To make your own barometer, you need a wide-mouthed jar, large good-quality balloon, side and bottom of a card- board box, rubber band, graph paper, tape, drinking straw, large deep pan, and hot water. (Note: make sure your jar fits into the pan.) Blow up the balloon, but don’t tie it. Let the air out of the balloon. Cut a large piece from the balloon. Make sure you can stretch it over the mouth of the jar. Next, fill the pan with hot water. Put the jar, mouth side up, into the pan and hold it down. Make sure no water gets into the jar. Have another person stretch the large balloon piece over the mouth of the jar, leaving extra balloon on all sides of the jar. Immediately put one or more rubber bands around the jar near the top. This is so that the balloon piece will not pop off. Then remove the jar from the pan. Tape one end of the straw to the center of the large piece of balloon (which is across the top of the jar). Reinforce the sides of the card- board with tape. Tape the piece of graph paper to the inside of the side piece of cardboard. Place the jar in front of the graph paper so that the end of the straw just touches the graph paper. Put a mark where the straw touches the paper. Find out the current barometric pressure and write it where you put the mark. As the barometric pressure rises, the pressure inside the jar will be lower than the barometric pressure outside the jar. As a result, the balloon piece will lower slightly, but the straw will rise. As the barometric pressure gets lower, the barometric pressure inside the jar will be higher than the barometric pressure outside the jar. This will push out on the balloon, causing the end of the straw to lower. Record the barometric pressure for a few days. Each time you record it, make a mark where the straw is and write down the number you recorded. After you do this a few times, you will begin to see a pattern. You may then stop taking measurements. Estimate the pressure at each gap midway between your recorded numbers, and fill in these figures. Then you can read the barometric pressure whenever you want, with your own barometer!
Elementary Student Work Sample 56 Standard 2—Integrated Learning Context Performance Indicators Students: . . .demonstrate the difference between the knowledge of a skill and the ability to use the skill . . .solve problems that call for applying academic knowledge and skills.
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- Fall '17