Tried and True: Water Screen: A Discrepant Eventby: Todd Hoover

Journal ArticleDigital resources are stored online in your NSTA Library.

This column provides classic demonstrations and experiments with a new twist. This month’s issue uses a discrepant event to demonstrate properties of water and the effects of air pressure.

Grades
  • Middle
Publication Date
11/1/2011

Community ActivitySaved in 143 Libraries

Reviews (3)
  • on Tue Oct 01, 2013 10:45 AM

The author of this article has done an excellent job of demonstrating a discrepant event using a water screen, a jar and water. The 5E lesson plan is very thorough and easy to follow. What I especially like it the scientific explanations accompanying the lesson!!

Betty Paulsell  (Kansas City, MO)
Betty Paulsell (Kansas City, MO)

  • on Thu Dec 15, 2011 10:58 PM

I think the water screen is a nice discrepant event. It uses a little bit of trickery to get students to thinking about what they are observing. Discrepant events are a great way to get the attention of the students.

Susan German  (Hallsville, MO)
Susan German (Hallsville, MO)

  • on Mon May 27, 2013 8:17 PM

This is a complex activity that may encourage students to wonder why, but It builds on a more complex set of content ideas than I would use. The everyday background know may not spring directly from everyday experience and as such, the content may hinder rather than enlighten understanding.I would use this offering more as a deeper hands-on inquiry rather than as a demonstration. To me, discrepant events challenge student thinking, as this one may, but the event is simple and builds more on what students experience in their daily world and need to explain. Discrepant events are most effective when they are simple and relatively straight forward, stemming more from everyday experiences. They are great when the confound students but easily lead up to those little 'ahas' that ladder understanding in science.

Patricia  (Arlington, VA)
Patricia (Arlington, VA)


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