A hydrometer is a device that measures the content of salt in water. The steps to build this hydrometer are listed in an easy-to-follow procedure that uses simple materials. In addition, a method to assess students using their hydrometers and different salt water solutions is described. Also provided is a data table for students to record their results and questions for students to answer. The table can be a stand-alone assignment or can be incorporated into an interactive (lab) notebook. Finally, a grading rubric is included for constructing the model and using the hydrometer.
Click here to explore a easy hands-on activity where students dissolve sea shells in vinegar.
Sea shells in Vinegar Experiment
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