# Vacuum in tanks similiar torricellian vacuum

• B
• mcmpw
In summary, the discussion of perpetual motion is forbidden on this site and resources are provided to explain why. Water cannot have perpetual flow and the water levels will eventually equalize around 10 metres above the spillway of the catch tank.
mcmpw
TL;DR Summary
onsidering fluid dynamics and conversion of mass.......after all tanks and lines filled with water, then opening sluice valve to "tank a", afterwards others, water perpetual flow or no?

and if not, where will water levels equalize?

Welcome to PF.

mcmpw said:
... water perpetual flow or no?
No. Perpetual motion is not possible.
Discussion of PM is forbidden on this site.

mcmpw said:
... and if not, where will water levels equalize?
About 10 metres above the spillway of the catch tank. That is the height of a water-filled barometer, a column of water supported by atmospheric pressure with a near vacuum of water vapour above.

russ_watters
@mcmpw -- Welcome to PF. We do not allow discussion of PMMs here at PF, so your thread is now closed.

PF Forbidden Topics said:
Pseudoscience, such as (but not limited to):
Perpetual motion and "free energy" discussions (see our Insights Article here)
http://en.wikipedia.org/wiki/Perpetual_motion
http://www.skepdic.com/freeenergy.html
http://www.skepdic.com/perpetual.html

## What is a Torricellian vacuum?

A Torricellian vacuum is a type of vacuum created by filling a tube with mercury and then inverting it into a dish of mercury. The space above the mercury in the tube is a near-perfect vacuum, named after Evangelista Torricelli, who first created this type of vacuum in 1644.

## How does a Torricellian vacuum demonstrate atmospheric pressure?

A Torricellian vacuum demonstrates atmospheric pressure because the height of the mercury column is directly related to the atmospheric pressure exerted on the mercury in the dish. The higher the atmospheric pressure, the higher the mercury column will rise in the tube.

## What are the applications of a Torricellian vacuum?

Torricellian vacuums are primarily used in barometers to measure atmospheric pressure. They are also used in scientific experiments to study the properties of vacuums and the behavior of gases under reduced pressure.

## Why is mercury used in creating a Torricellian vacuum?

Mercury is used because of its high density, which allows for a manageable column height to measure atmospheric pressure. Other liquids would require much taller columns to achieve the same effect, making them impractical for everyday use.

## Can other liquids be used to create a similar vacuum?

Yes, other liquids can be used to create a similar vacuum, but they would require much taller columns due to their lower densities. For example, water would need a column over 10 meters high to achieve the same pressure measurement as a mercury column of about 76 centimeters.

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