10 meters is the maximum you can suck on EarthEarlier this week I asked a question. Here is it. Does vacuum suck water and denser liquids? . I knew the answer to that question. I wanted to clarify because my seniors in job were not agreeing with me.
Vacuum occurs when you rapidly vacate a medium such as air from something. We all know that there is air enclosed in everything. A glass is only half filled and the other half is air. So the glass achieves vacuum when you vacate that air. But this vacuum, if high enough, can even cause water to boil under room temperature. I am working in a company that provides engineering solutions and vacuum is often our best solution. I long feared this vacuum. I hated it because I never understood it fully. But "there is something in nothing", makes me very curious. If you want to know more about vacuum read from that link.
Now I saw an impressive video that proposed a "space straw". One side of a straw would be in space/under vaccuum and the other side dipped inside an ocean. A straw works like this- when you dip a small diameter tube such a straw into a liquid, the liquid due to its density will rise. It is called capillary action. But the liquid stops at a level on the straw. As the saying goes, it's only half full with other half occupied by air. You suck the air out and the liquid displaces in the place of air, following the path, falls in your mouth. What could suck air better than vaccum after all? And what has more vacuum than space after all? So all the air is displaced through such space straw into vacuum now and the liquid can now rise. But there is an issue. The water never rises above 10 meters. Here's why.
Pressure difference=density*height*acceleration due to gravity
Let's assume its a perfect vaccum, which space almost is, so 0 N/m2 is the pressure on one side and atmospheric pressure 101325 N/m2 on another. Ideally, all of the air is sucked out.
0-101325= 1000*(-9.8) * height of liquid column sucked. Approximating the value of acceleration due to gravity as 10 m/s2, we obtain height of liquid as 10 meters. Even if you sucked all the air out of earth, you cannot suck a liquid that is more than 10 meters deep. I took so much pain to calculate and understand all this haha.