A very long, narrow tube is sealed at one end, and is immersed in a fluid so tha

Question

A very long, narrow tube is sealed at one end, and is immersed in a fluid so that it fills up completely. The closed end of the tube is then lifted up out of the fluid, while the open end is kept submerged. What happens as the closed end of the tube is raised higher and higher? Assume the tube is long enough that the open end remains submerged. The tube always remains completely filled with the fluid (Figure A). The fluid initially rises with the tube, but only up to a point (Figure B). The fluid in the tube stays at the level as the fluid outside (Figure C). This happens because... ... the pressure from the weight of the fluid column in the tube will not exceed the atmospheric pressure outside the tube. ... the air pressure inside the tube will always be equal to the atmospheric pressure outside the tube. ... the pressure of the fluid will be constant throughout the length of the tube. Suppose this experiment s repeated, but in a room from which all the air has been completely removed. Which figure best illustrates what would happen in this case? Figure A Figure B Figure C

Explanation / Answer

Suppose that liquid is like water and length of the tube is less than 10m. In this case Figure A is correct. because "the pressure from the weight of the fluid column in the tube will not exceed the atmospheric pressure outside the tube"

For room without air the Figure C is correct.

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