demonstrations:floating_paper_clip

Floating Paper Clip

Materials: ★☆☆ Easy to get from supermarket or hardware store
Difficulty: ★☆☆ Can be easily done by most teenagers
Safety: ★☆☆ Minimal safety procedures required

Categories: Fluids and Surface Tension

Alternative titles:

Summary

A paperclip, normally too dense to float, can rest on the surface of water by using tissue paper and surface tension.

Procedure

  1. Fill a bowl with clean water.
  2. Attempt to place a paperclip on the surface, notice that it sinks.
  3. Tear a small piece of tissue paper and place it on the water’s surface.
  4. Carefully set a dry paperclip flat on top of the tissue, avoiding direct contact with the water.
  5. Push down the tissue until it sinks.
  6. Adding a drop of detergent will cause the paperclip to sink because the surface tension has been broken.

Floating Paper Clip (Surface tension) Experiment - Kids Fun Science:


📄🎞️ Make a paperclip float - Science Bob: https://sciencebob.com/make-a-paperclip-float/

Variations

* Test how many paperclips the water surface can hold before it breaks.

  • Try bending the paperclip into different shapes to see if it changes floating ability.
  • Compare water to other liquids (such as milk, juice, or soda) to test which has stronger surface tension.

Safety Precautions

None

Questions to Consider

  • Why does the paperclip sink when placed directly into the water?
  • How does surface tension allow the paperclip to stay on top of the water?
  • Why does the tissue paper sink while the paperclip remains floating?
  • Which liquids seem to have the strongest surface tension?
  • How do insects like water striders use surface tension in their environment?