# How will opening a vacuum box in a vertical water column affect the water level?

• alibaba2
In summary: in summary, when the lid of the vacuum box is opened, the vacuum inside causes the surrounding water to lower, and the level on the dish.
alibaba2
hi to all,
this one may sound silly but i just can't seem to understand how it will work out.
this is the setup - in a vertical water column (state of vacuum) a hollow box is attached to the base. all air from the box has been sucked out and the box contains a vacuum(fig A).

if the lid of the box is opened when inside the column, which of the following will take place?
- the vacuum in the box will automatically be taken by the surrounding water, in this way lowering the level of the water in the basin (fig B)

or

-the vacuum will release an ""empty space"" that will go to the top of the column and lead to the water level being raised (fig C)

10x

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Please show us how you have been thinking about it so we can figure out what is behind you getting stuck.

Note: in B and C, the box, itself, is made out of material less dense than water yet can hold it's shape with a vacuum inside?

You can see what happens in a lesser situation, where you have a gas at the top of the column ... how does the column balance? What happens if you reduce the pressure of the gas?

For the picture in B: what happens if the volume of the box is bigger than the volume of water in the dish?
For the picture in C: what happens next?

Judging from the experiment shown in the illustration, I'll assume it would take place at normal atmospheric pressures. Say, on Earth, in your conventional classroom?

When the box containing the vacuum is ruptured, the pressure gravity exerts on the air surrounding the setup would continue pushing the water inward, filling in the empty space, as shown in figure-B of your illustration.

It is B. The height of the water column is determined by he external air pressure, which will push the liquid in the dish up into the box.

so B is the correct option. the vacuum box, once ruptured would simply suck inside it a quantity of the water equivalent to its internal volume. no ""air gap"" will be created at the top of the column.

thank for all the replies. i have understood the physics behind this setup.

## 1. What is a "vacuum submerged in vacuum"?

A vacuum submerged in vacuum refers to a situation where there is a vacuum (a space devoid of matter) within another vacuum. This can occur in certain experimental setups or in outer space where there are regions with extremely low matter density.

## 2. Why is a vacuum submerged in vacuum important for scientific research?

A vacuum submerged in vacuum is important for scientific research because it allows scientists to study the behavior of matter and particles in a controlled environment with minimal interference from external factors. This can provide valuable insights into the fundamental laws of physics and help us understand the universe better.

## 3. How is a vacuum submerged in vacuum created?

A vacuum submerged in vacuum can be created in various ways, such as using a vacuum chamber to remove air and create a vacuum, and then creating a smaller vacuum within that using specialized equipment. In outer space, regions with low matter density naturally form vacuums within a larger vacuum.

## 4. What are some applications of a vacuum submerged in vacuum?

One application of a vacuum submerged in vacuum is in the study of particle physics, where it allows scientists to observe the behavior of subatomic particles without interference from air molecules. It is also used in the production of electronic devices, such as vacuum tubes, and in certain medical procedures.

## 5. Are there any risks associated with creating a vacuum submerged in vacuum?

Creating a vacuum submerged in vacuum can be a complex and delicate process, and there are potential risks involved, such as implosion of the vacuum chamber or release of harmful gases. It is important to follow proper safety protocols and use specialized equipment when working with vacuums submerged in vacuum.

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