Probably each of you has heard about perpetuum mobile or a device that once set in motion never stops. Our bird will not soak its beak forever, but as long as there is water in the glass (of course it can be refilled) it will tirelessly wobble for hours and days and try to "drink" it. How does this happen? It's not magic, it's physics, it's an example of so-called. heat engine. The bird was invented in 1945. To set him in motion, put a container of water in front of him and soak his beak in it for several seconds, and then let him nod. You will observe how the red liquid from the bubble at the bottom begins to move the tube upwards to outweigh the bird's head and cause it to re-dip into the water. And without end ;) How is that possible? When the beak of the bird is dry, all the red liquid remains in the lower bubble. In this case, the center of gravity is at the bottom, below the axis in which the bird inclines. Therefore, the "back" of the bird remains upright. If we wet the beak of the bird, we will observe an increase in the level of colored liquid in its neck, i.e. the tube leading to the head. This is due to a decrease in temperature as a result of evaporation, and thus also pressure in the bird's head. As a result of the rising level of the liquid, the center of mass of the bird rises until it exceeds the level of the axis of rotation and the bird then makes a tendency to water. And what liquid is in the bubble downstairs? It's methylene chloride. Gadget in detail: By small parts and purpose is not suitable for children under 8 years of age. Use only under adult supervision. The glass bubble is filled with non-flammable methylene chloride, however, after the bubble is broken and the liquid spills, it can cause slight irritation to the lungs and skin. Do not inhale, do not consume. Wash the spillage area with plenty of water, ventilate the room well. This does not make the toy dangerous, but you should be careful not to break it, so you need to pay attention not to leave it near animals or small children. bird drunk, look and admire ;) funny bird nodding and soaking its beak for long hours and days (if we replenish water) great educational equipment many long hours of fascinating observations