it is on Air Pressure. when we want to clean an aquarium, the water has to be pumped out first , so what is the relationship between this condition with air pressure. Help me out!
2006-09-16 18:47:12 · 6 answers · asked by dyna@cute 1 in Science & Mathematics ➔ Physics
Yes, you can drain water out of a fish tank with gravity, but the question is on pumping the water out.
An aquarium pump works by creating a higher pressure to move the water around, so do most other pumps. In the case where you are pumping out water from a fish tank you have the air pressure on top of the water to help you move the water around. Air has weight, about 7 miles worth of weight (the International Border of Space is recognized to be 7 miles high). We know this as one atmosphere of pressure. We don't notice it, because we are used to it.
If you took your fish tank up on top of Mount Everest and tried to pump it out you would need more pressure in the pump since the air pressure up there is reduced. Because you are on a huge mountain of rock the gravity is pretty much the same, so the major difference between the two situations is the air pressure.
If you were in a vacuum the air pressure would be even less and it would take more water pressure from the pump to move the same amount of water around. If you were in a diving bell pressurized to a higher pressure then your pump wouldn’t have to work so hard because the higher air pressure would help it even more as it pumped the water out. Again, the gravity is about the same, the only difference is in the air pressure.
If you fish tank was sealed and there was a vacuum in it would the pump have to work harder to pump out the water? If your fish tank was sealed and pumped to twice the outside air pressure, then how hard would the pump have to work? In each system the pump would have to work just as hard as it would if the tank wasn’t sealed. That’s because the Earth is, for all intents and purposes, a sealed environment.
Just visualize each situation in your mind and determine how the various differences in air pressure would affect the pump. Now imagine that you have an airtight flexible membrane on top of the tank and you are trying to pump the water out with your aquarium pump. If you pressed down on that membrane then you would be increasing the air pressure inside the tank and making it easier for the pump to work. If you were to lift up on the membrane you would reduce the pressure in the tank and make the pump work harder. Again it is all up to the air pressure, but now you know how a pump works. If you took out the pump and only had the airtight flexible membrane then you could act as the pump. If you pushed the membrane down then you would increase the air pressure and move the water out. If you pulled up on the membrane then the water would retreat and not flow out, if you pulled hard enough on the membrane you could actually make the water go up your pipe and back into your fish tank.
One type of pump uses a flexible membrane to keep the pressure vessel sealed. Valves make sure that the air or liquid only passes in one direction. The pumps motor runs a drive shaft that runs a piston, which is connected, to the membrane. When the piston goes up the pressure is decreased and the water is sucked in. When the piston goes down the pressure is increased and the water is forced out. The valves allow the water to only flow in one direction so the pump operates. This is a single stroke pump. When you listen to a pump you hear a purr sound, which is the motor pumping the piston. It is doing this quickly so the pump will move a steady stream of water, but if you slowed the pump down you would hear each stroke.
Can you think of another way that a pump could work? Another type of pump uses vanes on a drive shaft that rotates quickly. This is how the water pump on a car works. The pump has valves at each end, but what is pushing the water through the system? Just think about it, the vanes are shaped to push the water around and they fit tightly near the outer walls of the pump. As the pump turns it pushes the water through the system, just as if someone was rowing a canoe real fast. This pump doesn’t use a pressure difference to work it just pushes the water along.
2006-09-16 19:28:37 · answer #1 · answered by Dan S 7 · 0⤊ 0⤋
I am not sure about the air pressure thing; however, gravity will drain the water out with a small hose if your aquarium is above ground level. It is primary school physics - water finds its own level.
2006-09-16 18:51:04 · answer #2 · answered by Gane 2 · 0⤊ 0⤋
There are different procedures to clean things.
If you are using some kind of water gun to clean the aquarium, them it's mostly likely to do with the water pressure.
2006-09-16 18:52:19 · answer #3 · answered by Brenmore 5 · 0⤊ 0⤋
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2016-10-15 02:10:06 · answer #4 · answered by ? 4 · 0⤊ 0⤋
Air pressure will allow you to syphone the water out of the tank so you don't have to "pump" it out.
2006-09-16 18:52:23 · answer #5 · answered by Anonymous · 0⤊ 0⤋
it's all depending on gravity !! isnt that?
2006-09-16 19:00:08 · answer #6 · answered by Anonymous · 0⤊ 0⤋