Surface Tension - Thread In Frame

Purpose

To demonstrate surface tension.

Equipment

Wire ring on handle with wooden base, thread with loop in center, soap solution, pointed pencil.

Setup Time

5 min.

Images

F3-05

Description

A thread with a loop at its center is connected across a diameter of a wire loop. Dip the wire loop into soap solution, then puncture the surface inside the thread loop. The loop expands as shown in the photograph due to surface tension.