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Dartmouth

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Surface Tension

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Topics

Points of Emphasis

Prerequisites

Lab Activities

Measurement of the surface tension of a soap solution and of water by three methods: (1) from the pressure inside of a bubble, (2) from the rise of the liquid in a capillary tube, and (3) with a tensiometer.

Course Level

Introductory: P3, P13, P15

Student Handouts

Equipment

Number of set-ups available: 10

Per lab station:

1 soap bubble apparatus/ring stand and three clamps
2 pieces of rubber tubing/2 plastic mouth pieces
2 test tube clamps
2 cylindrical glass tubes (1 with a cork and 1 with a rubber stopper)
2 rubber tubes with glass tubes inserted
2 50 ml beakers (marked Soap and Water)
2 capillary tubes (1 precision bore)
1 stirring rod
1 circle template
1 ruler
1 flashlight
1 water manaometer
1 plastic tray to hold small items

Per class:

2 Fisher tensiometers/eye patches
2 Cenco tensiometers/glass dish
3 bottles of soap solution
3 bottles of distilled water
1 large bottle of distilled water
1 large bottle of concentrated soap solution
1 large bottle of ethyl alcohol
1 bottle of acetone
3 50 ml beakers
1 slide projector
1 ring stand/clamp and 3 pronged clamp

apparatus

student tensiometer

fisher tensiometer

Notes


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Site contact: largent@Dartmouth.EDU

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