Balloon Full of Carbon Dioxide
Effect of Pressure on Melting Point of Ice
The Liquid Phase of Carbon Dioxide
Vapor Pressure of Pure Liquids
Boiling Acetone at Reduced Pressure
Magic Sand Models Hydrophobic Effect
Surface Tension: Floating Duck
Surface Tension of Water: The Floating Paper Clip
Will Tissue Hold Water? Interfacial Tension
Computer NaCl Crystal Cleavage
Variation of Volume of Water With Temperature
Surface Spreading and Surface Tension
Gel Formation with Sodium Alginate and Calcium Chloride
Boiling Acetone or Water at Room Temperature
Density of Sulfur Hexafluoride and Sublimation pf Certain Gases
Surface Tension: Floating Duck
Description: Cotton batting is wrapped around a ring stand clamp and held on with a rubber band. The cotton “duck” floats on water but sinks when detergent is added to lessen the surface tension. Pictures of actual soaped ducks are available.
Source: UW Card Catalog
Year: N/A Vol: N/A Page: N/A
Keywords: Surface tension, Duck, Cotton batting, Surfactant
Rating: 
Hazard: Low
- Use of inert substances
Effectiveness: Good
- Results are clearly observable
- Good connection from demo to course material
- Clear contrast between behavior of systems
- Moderate reliability
- Time to results is low
Difficulty: Medium
- Precise and delicate manipulations required
- Simple procedures
- High degree of equipment cleanliness required
Safety Precautions:
- Eye protection required
- Gloves required
Class: Liquids and Solids, Intermolecular Forces, Thermodynamics, Surfaces
Division: General, Physical Chemistry
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