2A20.20 • Surface Tension: Lamella

Location: Cabinet 3

Photo Shows the Apparatus Used at the University of Texas at Austin

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Instructions/Notes:

• Start by rotating the circular handle to lift the labjack such that the surface tension ring is fully submerged in the water. Record the force measured by the dynamometer.
• Slowly lower the labjack until you see a lamella form (a raised portion if the water that hugs up against the tension ring - pictured below).
• Once the lamella breaks, measure the force.

Concepts Conveyed:

• Display the strength of surface tension.
• Determine the amount of energy contained in the lamella.

Close up of the lamella. It appears as a bubble just below the ring.

Last updated on February 27, 2025