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Density & Bouyancy of Same Size Soda Cans (Pam Collins)


Pam Collins

Principle(s) Illustrated

  1. Density
  2. Bouyancy


  • 5.d - Students know how properties of ocean water, such as temperature and salinity, can be used to explain the layered structure of the ocean, the generation of horizontal and vertical ocean currents, and the geographic distribution of marine organisms.

Questioning Script

Prior knowledge & experience:

Students understand that some things float and some things sink.

Root question:

Why does cold water sink and warm water rise?  Why does salty water sink and fresh water rise?

Target response:

Because of differences in density.

Common Misconceptions:

Students think things may sink or float because one is a solid and the other is not.

Photographs and Movies

YouTube Video


Middle School Science