This decrease results in the atmospheric pressure on the surface of the liquid pushing liquid up into the tube toward the area of lower pressure. When liquid is sucked through the tube over the hump and begins to empty into the other container, a decrease in atmospheric pressure is caused at the highest point in the tube (where it passes over the hump). A basic siphon consists of a tube in a larger container that goes up over a hump (the edge of the container) to empty out into a container at a lower level. Even though siphons have been used for thousands of years, modern scientists are still arguing about exactly which forces make siphons work.įor much of scientific history, scientists have believed that siphons work because of the force of atmospheric pressure. Exactly what principles are at work, though, is still a matter of debate. However, it's simply the principles of science at work. The first time you use a siphon, it may seem like magic. Placing the siphon hose in the middle of the container allowed them to increase the wine's purity by avoiding particles that floated at the top or sunk to the bottom of the container. Siphons helped them transfer wine from a large container to smaller containers. Today's cotton farmers still use siphons in a similar way to help irrigate their crops.Īncient Egyptians (along with people today) also used siphons in the winemaking process. Ancient Egyptians used siphons in agriculture to transfer water from canals to irrigation channels. Historians have traced the use of siphons back to ancient Egypt. Either way, once the siphon begins to work, it'll continue to drain the water from the pool until the water is gone or the end of the hose is lifted above the water level to stop the siphon. You could use your mouth to suck water through the hose to get the flow of water started, or you could use a small pump. How does it work? All you need to do is put one end of the hose in the pool and the other end outside the pool, below the level of the water in the pool and in an area where you want the water to drain. Or, you could simply rely on science and siphon the water out! If you've ever used a siphon, you already know that all you need is a simple garden hose and a little time and soon that pool will be empty. If the pool doesn't have a drain, you may be forced to rely on buckets to empty it. When autumn arrives and the leaves begin to fall, it's probably time to empty the pool to prepare it for winter. Have you ever tried to empty a large container of liquid? For example, let's say you have an above-ground pool.
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