School Project...Help if you can!!!

[octavia webber]

:06: :11:

If you know the answer to this question please write a detailed explaination.

If you full a container with water and place a small bottle inside the container...with the small bottle held upside down with the opening facing the bottom of the container (cap of the bottle is off)...allow bottle to be filled with water in that upside down position...while the bottle remains upside down and filled with water, place your hand over the bottle's opening...remove your hand THEN and slowing raise the bottle out of the container of water...WHY DOES THE WATER STAY IN THE BOTTLE EVEN THOUGHT THE BOTTLE IS STILL UPSIDE DOWN??????

 

[Diver0001]

with or without something covering the open end of the bottle? (there are two answers to this question depending on how you do it--one of them has to do with air pressure exerting a force in all directions and the other has to do with surface tension and viscosity).

R..

 

[Laurence Stein DDS]

:06: :11:

If you know the answer to this question please write a detailed explaination.

If you full a container with water and place a small bottle inside the container...with the small bottle held upside down with the opening facing the bottom of the container (cap of the bottle is off)...allow bottle to be filled with water in that upside down position...while the bottle remains upside down and filled with water, place your hand over the bottle's opening...remove your hand THEN and slowing raise the bottle out of the container of water...WHY DOES THE WATER STAY IN THE BOTTLE EVEN THOUGHT THE BOTTLE IS STILL UPSIDE DOWN??????

It's an easy answer!

What you described is essentially a water barometer. You can't see any change because the little bottle is not long enough. If you filled a much longer tube (over 34 feet) with water and submerge the open end into the water of the larger container, you WOULD see a space form at about 33 feet. The space contains a vacuum (actually a partial vacuum). If the area of the cross section of the tube under the vacuum containing water was exactly 1 square inch, then the column of water would weigh 14.7 pounds.

The same thing occurs in a traditional mercury barometer only it shorter because the mercury is more dense than water and the column is balance by atmospheric pressure at about 30 inches of mercury. If the area of the cross section of the tube containing mercury was exactly equal to 1 square inch, the weight of the mercury under the vacuum would be 14.7 pounds.

Also: 1Ata=760mm Hg (mercury)=29.92in Hg=14.7 lb/sqin=101.3 kPa

The actual heights of the respective columns varies with the actual atmospheric pressure.

The water seems to stay in the bottle because you don't see anything happen in your experiment since the little glass jar is not long enough to create a column of water that weighs more than the external atmospheric pressure with a resulting space at the top.

See...simple

Larry Stein

 

[rab]

It's an easy answer!
...
See...simple

Larry Stein

OK, but it still took you six weeks to get this easy one.
Now I wonder if octavia webber will ever come back to see it?

-Rob

 

[Laurence Stein DDS]

OK, but it still took you six weeks to get this easy one.
Now I wonder if octavia webber will ever come back to see it?

-Rob

WELL IF SOMEONE WOULD HAVE BROUGHT IT TO MY ATTENTION SOONER, THEN I WOULD HAVE WRITTEN SOONER. :11:

On to global warming....

Larry