2B40.15 - Buoyancy - Finger, Water, and Scale

Code Number:
Demo Title:
Buoyancy - Finger, Water, and Scale
Area of Study:
Heat & Fluids
Digital Scale, Beaker, and Water.

Place the beaker of water on the scale and tare the scale.  As you press your finger into the water the scale reading will increase.  Basically this reading is a direct measurement of the buoyant force that the water is exerting on the finger.

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  • Janice VanCleave, "4, Weigh Your Hand", Teaching the Fun of Physics, p. 13.

Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.