Name: Fluid Statics and Properties of Fluid
Uploaded: 2019-07-19
Duration: 9 min 36 s
Description: In this video, we will go through an introduction for a fluid at rest, i.e., fluid statics, their few properties like density, and discuss density in detail.

Question

What is Torricelli vacuum? Is it perfectly vacuum ? Explain with reasons what happens in the following case:-
A glass tube

1 m

long and closed at one end, is filled with mercury and then inverted over a trough of mercury with the open end dipping into the mercury of the trough, in a vertical position.

Accepted Answer

The vacuum formed when a long tube, closed at one end and filled with mercury, is inverted into a mercury reservoir so that the open end of the tube is below the surface of the mercury. It is named after Evangelista Torricelli, who was responsible for the design of the mercury barometer.

The empty space in the tube is called the Torricellian vacuum.

No, it is not a perfect vacuum. Toricellian vacuum is a vacuum created in a hard glass tube containing pure and dry mercury closed at one end, when this glass tube is inverted again in pure and dry mercury contained in a trough so that the end of the tube remains inside the mercury trough.

Now, a glass tube $1 m$ long and closed at one end, is filled with mercury and then inverted over a trough of mercury with the open end dipping into the mercury of the trough, in a vertical position.

This causes the mercury in the tube to fall down until the difference between mercury on the surface and in the tube is about $760 mm$ . Even when the tube is shaken or tilted, the difference between the surface and in the tube is not affected due to the influence of atmospheric pressure.

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