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A drinking bird, also known as the dunking bird, drinky bird, water bird, and dipping bird [1] [2] [3], is a toy heat engine that mimics the motions of a bird drinking from a water source. They are sometimes incorrectly considered examples of a perpetual motion device. [4]
The engine consists of a set of sealed chambers arranged in a circle, with each chamber connected to the chamber opposite it. One chamber in each connected pair is filled with a liquid with a low boiling point ( propane ( T B = −42 °C) and R-12 ( T B = −29.8 °C) are listed in the Mother Earth News articles).
English: Bill reveals the operation and engineering design underlying the famous drinking bird toy. In this video he explores the role played by the water the bird "drinks," shows what is under the bird's hat and demonstrates that it can operate using heat from a light bulb or by "drinking" whiskey.
The retro “drinking bird” is making a surprising comeback — as the inspiration for a clean ... also known as the “Dippy Bird,” to develop an engine capable of using the power of water ...
English: The drinking bird is a heat engine that exploits a temperature differential to convert heat energy to a pressure differential within the device, and perform mechanical work. Licensing Public domain Public domain false false
An example of a DCM heat engine is the drinking bird. The toy works at room temperature. [17] It is also used as the fluid in jukebox displays and holiday bubble lights that have a colored bubbling tube above a lamp as a source of heat and a small amount of rock salt to provide thermal mass and a nucleation site for the phase changing solvent.
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The water in the glass would have all evaporated within a year unless the air was kept at 100% relative humidity and in that special case the bird would still not operate as there would be no evaporation from the beak and consequently no cooling and thus no operating "heat engine."