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June 4, 2014 From the Front Lines

End of the Year Physics: Phase Changes and Student Growth

  • About the Author
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About Colette Bennett

Colette Marie Bennett is the Curriculum Coordinator for English Language Arts, Social Studies, Library Media, and Testing for the West Haven Public School System in West Haven, Connecticut. Previous to this position, she served as the Chief Academic Officer (7-12) for Regional School System #6 in Litchfield, Connecticut. She has 23 years of teaching experience in English Language Arts from grades 6-12, including electives in journalism, drama, and film studies. A graduate of the Alternate Route to Certification, Bennett also has a Masters in English from Western Connecticut State University a 6th year in Advanced Teaching and an 092 Administrative Certificate from Sacred Heart University, and graduate credits from the GLSP in Social Studies at Wesleyan University. She holds a Literacy Certification (102) from Sacred Heart University for grades K-12. She has presented how technology is incorporated in classrooms at the Connecticut Computers in Education Conference (2010, 2012, 2014), the National Council of Teachers Annual Conference (2010, 2012, 2013, 2014, 2015), and the Advanced Placement Annual Conference (2011) the Literacy for All Conference (2012), and the ICT for Language Learning in Florence, Italy (2014). She blogs about education at Used Books in Class: http://usedbookclassroom.wordpress.com/ She tweets at Teachcmb56@twitter.com
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As the school year comes to a close, the buzzphrase is “student growth.” All stakeholders in education want to be able to demonstrate student growth, especially if student growth could be on an upwards trajectory .

Last week I had an opportunity to consider student growth with a different lens, and that lens was provided by a graduating senior who was preparing a presentation to a group of 7th & 8th graders.

I had assigned Steven and his classmates the task of developing  TED-like-Talks that they would give to the middle schoolers. The theme of these talks was “The Most Important Lesson I Learned in 13 Years of Education.” The talk was required  to be short (3-5 minutes), to incorporate graphics, and to make a connection between what was learned and the outside world. I asked students to come up some “profound” idea that made the lesson the most important lesson in their academic career. I gave them several periods to pitch ideas and practice.

Steven’s practice presentation was four slides long on the lesson “Phase Changes of Water.” There was a graphic on each slide that illustrated the changes of water from solid ice to liquid to vapor. The last slide illustrated the temperatures at which water underwent a change and the amount of heat energy or calories expended to make that phase change (below):

phaseplot

“What you see in this graph,” Steven explained, “is that there is a stage, a critical point, where the amount of energy needs to increase to have water change from solid to liquid. The graph shows that stage of changing from solid to liquid is shorter than the stage where the amount of energy needs to increase to change water into steam.”
He pointed to the lines on the graph, first the shorter line labeled melting and then longer line labeled vaporizing.
“So how is this a profound idea?” he asked. “Well, this chart is just like anything you might want to improve on. Sometimes you are working to go to the next level, but you hit a plateau, a critical point. You need to expend more energy for a longer period of time to get to that next level. Thank you.”

We clapped. Everyone sitting in class agreed that Steven had met the assignment. He met the time limit. He had graphics. He made a connection.
I saw something even more profound.

In less than three minutes, Steven had used what he had learned in physics to teach me a new way to consider the learning process. I could see phase changes or phase transitions to illustrate the relationship between energy expended over time and academic performance. I could relabel the side marked heat energy to a label of “energy expended over time.”  Some phase changes would be short, as in the change from ice to a liquid state. Other phase changes would be longer, as in the change from liquid to gas. Each line of phase change would be different.

For example, if I applied this idea to teaching  English grammar, some student phase changes would be short, as in a student’s use of pronouns to represent a noun. Other phase changes could be much longer, such as that same student employing noun-pronoun agreement. Time and energy would need to be expended to improve individual student performance on this task.

But whose energy is measured in this re-imagined transition? Perhaps the idea of phase changes could be used to explain how a teacher’s energy expended in instruction over time, or during a critical point, could improve academic performance. The same idea could be used to demonstrate how a student must expend additional energy at a critical point to improve understanding in order to advance to the next level.

At the end of the school year, teachers need to provide evidence of individual student growth, but perhaps a student is in a transitioning phase and growth is not yet evident?  The major variable in measuring student achievement is the length of the critical point of transition from one level to another, and that length of that critical point could extend for the length of a school year or maybe even longer. Growth may not be measured in the time provided and more energy may need to be expended.

What was so interesting to me was how Steven’s use of phase changes had given me another lens to view the students I assess and the teachers I evaluate. Because measuring academic progress is not fixed by the same physical laws where 540 calories are needed to turn 1 gram (at 100 degrees Celsius) of water to steam, each student’s graph of academic achievement (phase changes) varies. Critical points will be at different levels of achievement measured by different lengths of energy expended. Despite the wishes of teachers, administrators, and students themselves, “growth” is rarely on that 45º trajectory. Instead, growth is represented by moving up a series of stages or critical points that illustrate the amount of energy, by student and/or teacher, spent over time.

Energy matters, in physics and in student achievement. Steven’s TEDTalk gave me a new way to think about that. I think he gets an A.

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