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Aliens - Drinking Bird Mistake
In the opening scene on Alien you pan over various parts of the ship. In the lunch room is one of those drinking birds that nods up and down. Those work by the moisture in the glass keeping the head moist and so heavier. If you're ever had one of those, you know that when the water in the cup evaporates below where the bird beak can reach, they stop rocking. As everyone was asleep in the pods for an extended period of time, the bird couldn't possibly be rocking.
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Contributed By: kcuhC on 04-16-2001 and Reviewed By: Webmaster
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zank frappa writes:
How can you be sure they're using water? They could be using some liquid that doesn't evaporate at room temperature. Remember that it's a science fiction movie. The toy may have evolved.
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jmack writes:
The toy works by evaporation so having a low temp fluid would stop it working; however if the the glass was automatically refilled by a drip feed or similar, it could keep going indefinitely.
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pilousky writes:
Xanbo, Solids don't evaporate they sublimate. Also, evaporation is not about reaching escape velocity; gravity is not what hold the molecules of a liquid together. Finally, evaporation in an atmosphere is an equilibrium process. If your atmosphere is already saturated with the gaseous form of the liquid (if enough humidity is present in the air)then the water level in the dish will not go down (but then, the bird will stop working anyway)
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xanbo writes:
zank frappa- All liquids evaporate, regardless of temperature (unless absolute zero, which is only theoretical). Even a solid will evaporate, although at a much lesser rate. Temperature is a representation of the AVERAGE velocity of molecules, and there are always SOME that have enough speed to achieve escape velocity and therefore evaporate.
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