Capillary Action 2 - Physics Demonstrations - Capillary Action 2 | Physics Undergraduate Labs

Ensure the water box is securely mounted and cannot tip over onto the projector. Water and electrical equipment require careful positioning and supervision.

Purpose

Capillary action in narrow tubes draws water over a barrier, initiating siphon flow without external priming. Students observe how surface tension forces at the molecular scale can start macroscopic fluid transfer.

Capillary siphon apparatus: clear box with U-shaped capillary tubes mounted on a rod and stand, shown both directly and projected via horizontal projector

Figure 1: Top: Capillary siphon apparatus mounted on a rod. Bottom: The apparatus projected via horizontal projector for classroom visibility.

Safety Warnings

Warning: Projection Setup

Purpose