Molecular Size and Mass Kit

Item # C4-1000

Regular price $59.00
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Use indirect measurement to find the diameter of a single molecule! First, students model the process using ball bearings, then repeat the experiment using oleic acid floating on water. Enough supplies for dozens of repetitions.

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Additional Details

This kit gives students the tools they need to estimate the diameter of one molecule of oleic acid using indirect measurement.

First, they model the experiment using ball bearings, using a known volume to make a flat "pancake" and then finding its thickness. Then a single drop of oleic acid solution is placed on a water surface, allowing students to estimate the diameter.

Kit includes oleic acid solution, chalk, 12 droppers, bb's, and complete instructions. Enough for 8-12 student groups to repeat the experiment dozens of times.

The Molecular Size and Mass Kit can not be shipped outside the continental United States.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to

Products being sold are not toys. They are for Educational / Laboratory use only. They are not for use by children 12 and under.


What’s Included

  • 1L Oleic Acid Solution (5mL acid in Ethanol)
  • Piece of chalk
  • 12 eye droppers
  • ~4000 bb’s (~400mL)


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Conceptual Academy Videos

The Atomic Nature of Matter: Molecules