What is the siphon phenomenon? What is the phenomenon of siphoning

A phenomenon in which a liquid flows from a container with a higher liquid level through a curved tube into a container with a lower liquid level due to atmospheric pressure. It occurs when the curved pipe (siphon) is filled with liquid, and the pressure of the liquid column above the higher liquid level does not exceed the atmospheric pressure. For example, car drivers often use a siphon to suck out gasoline or diesel from an oil drum; In Henan and Shandong, siphons are used to divert water from the Yellow River to irrigation farmland. In daily life, such as changing the water in the fish tank, etc.

Siphoning phenomenon The siphoning phenomenon is caused by the gravitational force and potential energy difference between liquid molecules, that is, the pressure difference between the water column is used to make the water rise and then flow to a low place. Since the nozzle water surface is subjected to different atmospheric pressures, the water will flow from the highest-pressure side to the lower-pressure side, until the atmospheric pressure on both sides is equal, and the water surface in the container becomes the same height, and the water will stop flowing. The siphon phenomenon is used to quickly pump out the water in the container.

The siphon is an ancient invention of human beings, as early as the 1st century BC, someone made a peculiar siphon.

In fact, siphoning is not entirely caused by atmospheric pressure, but can also occur in a vacuum. The force that makes the liquid rise is the cohesive force of the molecules between the liquids. In the event of siphoning, the liquid continues to flow in one direction because more liquid flows out of the tube than into the tube, and the gravity on both sides is unbalanced.

As the liquid flows into the tube, the higher it goes, the lower the pressure. If the liquid rises from a very high tube, the pressure will be reduced to such a point that bubbles (made up of air or other gases) will be formed in the tube, and the height of the siphon will be determined by the formation of bubbles. Because the bubbles disconnect the liquid, the force between the gas molecules at both ends of the bubble is reduced to 0, thus destroying the siphon effect, so the tube must be filled with water.

At normal atmospheric pressure, the siphon works better than in a vacuum, because the atmospheric pressure on both nozzles increases the pressure inside the entire siphon.

Example: Insert one end of a hose filled with water into the water and the other end hanging out of the container containing the water, and the outlet should be lower than the water surface. In this way, water will flow out of the container and down the hose.

Siphon phenomenon: 1. Relying on atmospheric pressure, the phenomenon of using a curved tube to lead the trapped liquid from the high liquid level to the low place. The siphon phenomenon has many applications, such as in Henan and Shandong in China, where water from the Yellow River is often diverted across the river embankment to irrigate farmland.

2. Siphonage is the use of the force phenomenon of the height difference of the liquid level to fill the liquid with an inverted U-shaped tubular structure, and place the high end of the opening in a container filled with liquid, and the liquid in the container will continue to flow out through the siphon to a lower position.