I found it
The chinese have long known the principle of iris. Iris straws, made from the application of the iris principle, are known in ancient chinese times as “notes”, “preference”, “drying” or “overland dragons”. In the final year of east han, there was a thirst for irrigation. Ethnic minorities in the south-western region also use rainbow-sucking as a physical phenomenon when drinking with a corroded bamboo tube. The song dynasty, in the zheng dynasty of the book, used bamboo canisters to document the flow of the springs from which the mountains were drawn. In ancient china, canisters were also produced using the iris principle. The cylinders are a necessary fire extinguisher in war. In volume iv of east poe, song dynasty soo-jin recorded salt water being sucked to the ground from silos in sichuan salt wells。
It is written in: "on the bottom of the bamboo, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you, you know, you know, you know, you know, you, you know, you, you, you, you, you, you “the ming dynasty tree book also addresses the method of pouring water into tree seedlings with snorkels, as well as the principle of iris in ancient china。
This principle has also been applied in han dynasty's invention of the iris lamp, which is also known as the lantern, which has a lantern, a lantern with an empty cavity, internal water, and the use of the iris tube (the pyrotechnic pipe) to dissolve the pyrotechnic into the water, so that the air can be purified. The book "gang yoonko nine medicines" of the north-south era says: "strew the bottle with water, pour it down; no water, no air, no water." the wells, although they are a thousand years old, are on the water; the caps, if they do not fall, are not lifted.” there are two small holes in the bottle that can pour out water, and if a small hole is closed, the air pressure outside the other hole will be greater than the pressure in the bottle and the water will not come out。
The physical phenomena of atmospheric pressure are described more clearly in the note to king tang dynasty's ice "quiz": "the emptiness of the tube is full, suspended, the water is secured, and it cannot be lowered for no lift; the empty bottle is empty, inert, and unable to enter for no breath". It was pointed out that an empty bottle with a small mouth could not be filled with water because the gas could not come out。
In the conversation on the sea, song dynasty added to the findings of his predecessor, saying: “as a child is taught, a piece of paper and an empty bottle is burned in the water of the silver basin, and the water pours into the bottle, and the silver bottle is so loud that the flames make it clear, and it is placed on the man's belly in accordance with the law. In empty bottles, paper is burned, as the fire throws a part of the air out of the bottle, negative pressure is created in the bottle after the fire has been extinguished, creating a vacuum, and the air pressure outside the bottle is pressed tightly on the person's stomach. If you put the bottle in the water, the water immediately flows into the bottle。
Ming dynasty also pointed out in his book "uncle zinjiang", that the spoon was poured into the water, and that the water was not entered because of the air。
Iris sucking principles
Physical phenomena
The highest point liquid in the tube moves to the lower level under gravity, generating negative pressure within the u-type tube, leading to the high point where the liquid in the high-level tube is sucked to form a rainbow。
Legend
The right-hand figure refers to the “barrel pressure difference” and indicates that, as a result of the almost identical pressure on both sides, the pressure of the lower tube is greater at the lower level than at the higher level, but the fluid is still flowing from the upper to the lower level because the depth of the upper surface is much lower than the depth of the lower tube. This occurs because the pressure here is only transmitted to the surface of the liquid. So the tube in the lower cup, although under pressure, could not be transferred to the higher cup and therefore could not prevent the liquid from falling。
Conditions for use
The use of iris must meet three conditions:
1. Fill the tube with liquids
2. The upper point of the tube shall not be above the height of the water column supported by atmospheric pressure at the surface height of the container。
