Water Content

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Author: Judee Shipman

We often wonder how much water is in the foods we eat. We're also fascinated to learn that we ourselves are made of more than 95% water. In this experiment we test the water content of substances found in nature. Methods of calculating water content include dehydration, chemical titrations and mechanical devices that are sensitive to the properties of water.


How is water content measured?


  • Computer with Internet access     
  • Color printer
  • Digital camera
  • Typical office/hobby/hardware/craft supplies (paper, poster board, glue, etc.)
  • Testing samples (rock, wood, fruit, soil, motor oil, etc.)
  • Standard kitchen oven OR toaster oven.
  • Small digital weight scale.


  1. Read overview of relevant topics (see bibliography below and terms listed above)
  2. Address all of the above terms and research questions.
  3. Search and print out interesting water-related images.
  4. Take photographs throughout the course of the experiment.
  5. Collect your testing samples and test each sample for water content, using any of the methods described in the links below.
  6. Carefully record all observations
  7. Analyze your data.
  8. Interpret your findings in a detailed report.
  9. Include interesting photos, diagrams and models in your science fair display.
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