PIRA 4C31.30 - Cooling by Evaporation: Drinking Bird
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Photo of University of Texas at Austin's Demonstration
Instructions / Notes:
- The drinking bird has a felt head and beak that needs to be wet.
- Evaporative cooling causes vapor pressure in the neck to be less than the vapor pressure in the lower flask.
- The condensing liquid rises up the neck to compensate, raising the center of mass.
- Two drinking birds, one with a glass of alcohol and second with water, is the preferred presentation.
Last Updated 11/01 - University of Texas at Austin Physics Department - All Rights Reserved