คุณลักษณะ

• This familiar bird is a kind of heat engine using the temperature difference between the top and bottom of the bird.
• The lower part is the same as the room temperature, but because the upper part is wet, it is cooled by evaporation heat.
• The center of gravity moves upward as the liquid inside, which has a low boiling point, gradually rises.
• The imbalance of the pendulum makes a gesture just like drinking water.
• At this time, the liquid inside is restored and the movement is repeated.