Pressure based idea

[tbird]

truth,

you must have missed the 100kg weights on each cylinder. since the diameter of transfer tube is much reduced in size, the amount of weight to move is too.  as long as the 100kg is more than half (the top will pull the other half, closed system) the weight of the column, the water will transfer.   he may have to reduce the area the 100kg is spread over to insure enough weight per sq in, but it will move, won't it?

also, i have to wonder if the hydrostatic paradox applies to a body of water cut off from atmospheric pressure.  how much pressure does water in a straw, with your thumb over the top, have at the bottom?  if it doesn't come out, will it show a weight on the bottom of the water or is it all transferred to the weight of the straw?

[Gravitator]

...or maybe it is not busted. For some reason I just can't figure this out.



@truth

In learning I try my best I have tested this little experiment and I know that it is very
difficult to rise water. In my pictures the water is not lifted with lower tank's weight.
It is lifted with upper tank's weight which will create a negative pressure - like in old fashion
pump with limit of 9,81 meters height.



@all

In these four pictures I try to explain, what I don't understand and what I understand.


Picture 4

In hydrostatic paradox the water level is always same and from this point of view I understand
that the hydrostatic pressure will not change.


Picture 3

In jar there is mercury at the bottom. If I add some water on mercury this will increase
the total pressure in mercury. After added water the hydrostatic pressure at the bottom of
jar is height of mercury * 13,6 + the pressure of waters weight.


Picture 1

In this picture there is an illusive tube from sea to outer space. The water is pushed to tube
by weight of air - not by air pressure. The air pressure is hydrostatic pressure of air on the ground.

Beside illusive tube there is a short cut to do the same. Now the big question is from what level
should I start to count the depth when I want to know the hydrostatic pressure. From "general" water level
or from tube's water level. If from tube's water level this means that if the short cut is done
somewhere on earth this will increase the hydrostatic pressure all the round in world. And I don't think
this is the case.


One thing that has been in my head is the next simple experiment. Imagine a glass of water and hydrostatic
pressure at the bottom of glass. Put a paper on it. Now turn the glass upside down and imagine the hydrostatic
pressure at the bottom of glass (just upon the paper). The water will stay in the glass because of air pressure
and the hydrostatic pressure is still the same.

Now put the glass into water so that the paper is just little bit under water and remove the paper.
The water will still stay in the glass. But what happens here ?!?! Is the water level just a replacement to
paper and the hydrostatic pressure that was in the glass don't change ?



Picture 2

In this picture there is same situation than it is on earth. The only difference to Picture 1 is that
the water have been replaced with mercury and air with water.

Now how I see this is that the rising mercury is just a replacement to "missing" water. What I mean
with this is that the hydrostatic pressures at the bottom in Picture 1 and Picture 2 are equal.
The rising mercury will not change the level from where you should start counting the hydrostatic pressure.
It will just rise the total pressure all around mercury.

If this is not what happens then in Picture 1 the jar done in Spain should increase the hydrostatic pressure
in Japan at one meter depth.


And as a conclusion I think that in raised water/mercury you should count the hydrostatic pressure from top
level to "general" level which means that there is a pressure difference depending.


...or maybe not

[tbird]

Gravitator,

in pic 1, has the air in the tube to outerspace been pulled out?  if not the water will not rise in that tube, i think.

tom

[Gravitator]

tbird,

Yes, it is pulled out.

[brian334]

this is daum.