RVFM Drinking Bird

Rapid
Order Code:

06-6838

Brand: Rapid MPN: PH20065
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Discontinued


A classic toy that is really a heat engine!

The bird demonstrates the cooling effect caused by evaporation of water on its beak. The cooling causes a volatile liquid in the bird's body to condense, then evaporate again as it warms up, constantly changing the balance of the bird's body.


  • Push the bird's head into water to begin the bobbing motion
  • Continues to 'drink' as long as there is water in the container

The bird works best in warmer areas as it relies on there being a sufficient temperature difference between the bird's beak and its surroundings. Should the bird fail to bob, gently heating the glass bulb in the bird's tail with a hair-dryer on a low setting should suffice.
Type Drinking bird

Questions

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Thursday, January 31, 2019 | Question by: Rapid Customer | Product code: 06-6838
Q. How long does each complete cycle take, roughly, eg between drinks?
A. Hi Jonathan, thank you for your question. Approximately 1-2 seconds once at room temperature.
Friday, November 4, 2011 | Question by: Rapid Customer | Product code: 06-6838
Q. I cant get mine to work, I dip the birds beak into the water and it bob's back an forth then it gets slower and slower then stops, the red liquid gets just up the tube just into the head but not enough for it to over balance and dip into the water, help
A. It sounds like the ambient temperature in the room is slightly too low to get liquid in the bird to evaporate. The differential in temperature is what is important. If the liquid is rising most of the way up, the room is probably only a couple of degrees too cool for it to work properly. You should get much better results in a warmer room with cool water.

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