2007-09-09 21:22:09 · 3 answers · asked by nobelprize_geetha 1 in Science & Mathematics ➔ Earth Sciences & Geology
Hi thank you for the answers... but i just want to know hand pumping .. not abt suction pumps or any other .
2007-09-10 02:56:20 · update #1
"can't"? as in an absolute law of physics kind of "can't"? that seems very unlikly. The only reasons that might be true would be if the weight of the water was too heavy, but then why not just use a smaller pipe/hose and use a stronger man who could pump it up to 32ft?? Atmospheric pressure would actually work in your favor, it'd be lower pressure at the high end and the higher pressure below would actually help force the water up the pipe/hose. (a concept known as siphoning).
I don't think that would be true then.
2007-09-09 21:36:41 · answer #1 · answered by jadespider9643 4 · 0⤊ 0⤋
It depends. if you are using a suction pump (one that acts like a vacuum cleaner), it can't raise the water to a height greater than a column of water supported by the atmosphere (about 32 feet.)
If you took a sealed tube, open at the bottom only, then filled it with water and imersed the open end in a vessel containing water; you would find that the level of water in the tube would rise to 32 feet. A heavy liquid like mercury would have a much lesser 'standing height, of about 30 inches.
Imagine sucking on a straw. What you are actually doing, is creating a vacuum in the straw by drawing the air out, and atmospheric pressure is forcing the liquid up the straw. But no matter how hard you sucked, you could not draw any liquid up the straw, if it were taller than 32 feet.
A suction pump works in the same way, drawing water up with the aid of atmospheric pressure. Because atmospheric pressure is aiding the pumping action, vacuum pumps are very efficient.
However, if you need to raise the water higher than 32 feet, you need to introduce 'stage pumping', where a second pump will raise the water another 32 feet.
However, there are other methods of pumping besides vacuum pumping. If a piston pump is used to 'push' a column of water from the bottom, then it isn't limited to the 32 feet, but it is much less energy efficient.
2007-09-10 09:40:31 · answer #2 · answered by AndrewG 7 · 1⤊ 0⤋
It is a fact,it is 29 point something feet, the pump creates a vacuum in the pipe, atmospheric pressure ( 14.7 IIbs per square inch) pushes the water up the pipe, a stronger pump makes no difference
2007-09-10 05:06:56 · answer #3 · answered by joe 6 · 1⤊ 0⤋