Eyedropper Hydrometer: Buoy your understanding of density

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Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

Quick Guide

Preparation Time:
5 to 10 minutes

Learning Time:
5 to 10 minutes

Estimated Materials Cost:
1 cent - $1 per student

Age Range:
Ages 8 - 18

Resource Type:


Materials List (per student)

  • Plastic pipet or eyedropper (narrow stems work best)
  • A cup or beaker
  • Permanent marker
  • Scissors
  • Sand
  • Salt
  • Water
  • Masking tape
  • Ruler that displays centimeters
  • A small piece of paper that you can fold into a funnel


  • Earth and Space Science
    • Earth Structure
      • Oceans and Water
  • Physical Sciences
    • States of Matter
      • Liquids
  • The Nature of Science
    • The Scientific Process
      • Conducting Investigations
      • Gathering Data


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Access Rights:

  • Free access