Every science enthusiast should have a drinking bird on a shelf somewhere. Simply wet its head and put a glass of water nearby for its beak to dip into. The bird will tip down, "drink," and then tip up. This happens over and over again. It works because the wet head evaporates water which removes heat and causes a change in pressure. The liquid (Methylene Chloride) moves into the upper chamber. When enough liquid reaches the top, its center of gravity changes and the bird tips down, absorbs water, and the whole process starts again. It's a great way to teach the connection between heat, pressure, and evaporation. Includes explanation of how the Drinking Bird works. CAUTION:The Drinking Bird is made of glass and contains a flamable liquid - not for use by children without close adult supervision. Sold individually.

Does humidity affect the Drinking Bird? Try setting the drinking bird in a dry space and count how many times per minute that it drinks. Then place the drinking bird on a wet towel and cover with an upside down aquarium. Count the drinks again after several minutes to see if it is affected by humnidity in the air. Does the temperature of the water affect how fast the bird drinks? Let us know what you find out!