3B Scientific Surface Tension Ring User Manual

3B SCIENTIFIC® PHYSICS

Surface Tension Ring U8412160

Instruction Sheet

06/08 ALF

1. Description

The surface tension ring is used for measuring the
surface tension of liquids.

It consists of an aluminium ring with a sharp-edged
profile. Attached to it are three threads with a hook
for hanging it on a dynamometer.

2. Technical Data

Diameter: 60 mm
Weight: 5 g approx.

Measuring the pulling-off force

Additional equipment needed:
1 Laboratory jack, type II U15020
1 Precision dynamometer, 0.1 N U20030
1 Beaker, 600 ml from set U14210
1 Stand base U13270
1 Stand rod, 470 mm U15002
1 Clamp with hook U13252
Distilled water

• Set up the stand rod in the base and attach the

clamp with hook near the top of the rod.

3. Sample experiments

1

•

Suspend the surface tension ring from the
dynamometer and suspend both together from
the hook.

• Fill the beaker with distilled water and place it

on the extended laboratory jack.

• Move the laboratory jack with the beaker on it

up to the stand and lower the ring until it is
completely immersed in the water.

• Read the force on the dynamometer and note it

down.

• Slowly lower the laboratory jack while observing

the dynamometer scale.

• Record the force at the instant when the edge of

the ring comes away from the water’s surface.

The difference between the two forces is the force
needed to overcome the surface tension and pull the
ring clear.

Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany • www.elwedidactic.com

3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com

Rights to amend technical specifications reserved

© Copyright 2008 3B Scientific GmbH