What is the principle of the drinking bird The principle of the drinking bird Introduction to the pr

This toy is not a type of second-class perpetual motion machine that harnesses the heat energy of the environment (in fact, according to the second law of thermodynamics, a second-class perpetual motion machine cannot exist). The "drinking bird" is just a typical heat engine that obeys the laws of thermodynamics. The reason why it nods its head and drinks water is because it uses some complex physics.

The head and body of the drinking bird are two thin-walled glass spheres (hereinafter referred to as the "upper ball" and "lower ball"), which are connected by a glass tube and contain ether liquid, forming a closed container. Since the ether liquid is volatile, the liquid above the liquid level is filled with the saturated gas of ether. The bird's head is surrounded by a layer of cloth that absorbs water.

Usually, the bird leans forward slightly. When starting, a little water is dropped on the bird's head, and the water on the cloth absorbs a large amount of heat when it evaporates, so that the ether saturated gas in the upper ball is cooled down and depressurized at the same time, resulting in the saturated air pressure in the lower ball is greater than the air pressure in the upper ball, and the ether liquid in the lower ball is pressed up along the glass tube, so the center of gravity of the whole bird moves up, thus breaking the equilibrium state of the fulcrum. When the bird's beak touches the liquid level, the upper and lower balls are just communicated through the glass tube, part of the gas in the lower ball enters the upper ball, the two parts of the gas are mixed, when the pressure in the upper and lower balls is the same, the liquid that loses the support of gas pressure will flow back to the lower ball under the action of its own gravity, and the center of gravity of the drinking bird moves down again, so it gradually stands upright and returns to the initial state.

Since the beak touches the surface of the water and wets the cloth around the bird's head when it "drinks", it begins to "drink" again.

The water evaporates from the downy feathers on the head of the drinking bird, and the head cools down.

The decrease in head temperature causes the dichloromethane vapor to be condensed, which lowers the head vapor pressure relatively below the abdominal vapor pressure.

The greater vapor pressure in the abdomen causes the fluid to flow upwards through the neck and into the head.

As the fluid enters the head, the head of the drinking bird becomes heavier.

The bird began to tilt. Liquid gets into the head. The bottom of the glass tube is no longer submerged in liquid.

Air bubbles enter the head through a glass tube. Due to the entry of air bubbles, the liquid is expelled from the head.

The fluid backs up to the abdomen, making the tail of the drinking bird heavier.

The drinking bird tilted back upwards again.

Gauze has the characteristics of loose and porous, and it is easy to absorb and conduct moisture under the action of capillaries. When the amount of water at the other end of the straw accumulates to a certain extent, the weight of this end will increase, and the other end will be lifted high like a seesaw. At this point, the gauze will break away from the surface of the water and no longer absorb water, and the water at the end of the straw will drip down under gravity, eventually causing this end to be lifted again.

Unboxing and trying to play with a drinking bird that can keep swaying if you have water to drink.

The Drinking Bird Principle is a typical heat engine that obeys the laws of thermodynamics, and it nods its head to drink without stopping because it makes use of some complex physical principles. The head and body of the drinking bird are two thin-walled glass spheres (hereinafter referred to as the "upper ball" and "lower ball"), which are connected by a glass tube and contain ether liquid, forming a closed container. Since the ether liquid is volatile, the liquid above the liquid level is filled with the saturated gas of ether.

The bird's head is surrounded by a layer of cloth that absorbs water. Usually, the bird leans forward slightly. When starting, drop a little water on the bird's head, the water on the cloth absorbs a large amount of heat when evaporating, so that the ether saturated gas in the upper ball is lowered while cooling, and because the temperature is reduced, the ether vapor becomes supersaturated, a small amount of ether vapor condenses into liquid, the amount of ether vapor becomes less, the gas volume is further reduced, and the exothermic prevents the temperature from decreasing, at this time, the saturated air pressure in the lower ball is greater than the air pressure in the upper ball, the ether liquid in the lower ball is pressed up along the glass tube, the pressure of the lower ball becomes smaller, the steam inside becomes unsaturated, and a small amount of ether gasification, The amount of ether vapor in the lower ball increases, and at the same time absorbs heat from the ether liquid, so that the center of gravity of the whole bird moves upward, thus breaking the equilibrium of the fulcrum.

When the bird's beak touches the liquid level, the upper and lower balls are just communicated through the glass tube, part of the gas in the lower ball enters the upper ball, the two parts of the gas are mixed, when the pressure in the upper and lower balls is the same, the liquid that loses the support of gas pressure will flow back to the lower ball under the action of its own gravity, and the center of gravity of the drinking bird moves down again, so it gradually stands upright and returns to the initial state. Since the beak touches the surface of the water and wets the cloth around the bird's head when it "drinks", it begins to "drink" again. The principle of internal change of the drinking bird is the same as that of superconductor heat pipes, and the heat energy is transferred through gasification and liquefaction, and the temperature of the actual steam does not change significantly.

<>1. The principle of drinking birds is a typical heat engine that abides by the law of heat sales, nodding and drinking water constantly, using some complex physical principles.

2. The head and body of the drinking bird are two thin-walled glass balls, which are connected by a glass tube and contain ether liquid to form a closed container.

3. The principle of internal change of drinking birds is the same as that of superconductor heat pipes, and the heat energy is transferred through the liquefaction of the gas bucket, and the temperature of the actual steam does not change greatly.

Categories: Education, Science, >> Science & Technology.

Problem description: The key dust Zen is what is in the belly of a bird?

Analysis: A fake perpetual motion machine full of mysteries.

Of course, this toy is not a perpetual motion machine, and the reason why it can nod its head and drink water is because it contains a complex physical school dust removal principle. It turns out that the liquid in the "drinking bird" is a volatile liquid such as ether, which is easy to evaporate at high temperatures, and the pressure generated by the saturated vapor of the liquid will change drastically with the change of temperature. a.

The head is cold, the air pressure drops, and the liquid in the tail rises along the neck due to suction. In this way, the weight of the head increases, the weight of the tail decreases, the position of the center of gravity changes, and when the center of gravity exceeds the fulcrum of the tripod and moves towards the head, the bird leans down to the balance position. This position can be adjusted by the weight of the beak.

b.The head is lowered, and two changes occur inside. One is that the beak of the "drinking bird" is soaked in water, so that the bird's head is wet.

The second is that the upper and lower steam areas are connected, and the two parts of the gas are mixed, and there is no pressure difference, but due to the absorption of heat from the surrounding air, the temperature of the Zhengsen steam rises slightly. At this time, the liquid that rises to the head flows down to the tail under the action of its own weight. c.

The tail becomes heavier, the head tilts upward, and all the liquid is concentrated in the tail, and at the same time, the steam from the head begins to cool again due to the freshly stuck water.

It turns out that the heat absorbed by the continuous evaporation of the head of the "drinking bird" is the driving force behind the movement of this wonderful "drinking bird". It is precisely because it uses energy sources that are imperceptible to the surroundings that it is mistaken for a perpetual motion machine.

Unboxing and trying to play with a drinking bird that can keep swaying if you have water to drink.

Unboxing and trying to play with a drinking bird that can keep swaying if you have water to drink.