[SOLVED] The empty space above mercury in a simple barometer is called
vaccum
.
Why is the space above the mercury level a vacuum?
The top of the barometer is filled with nothing (vacuum) because
the mercury must have the space to expand and contract without any other force affecting it
; a gas or liquid in the top would have its own pressure against the mercury and give inaccurate readings.
What is in the space above the mercury in a mercury barometer?
Barometer is used to determine the local atmospheric pressure. … The space would be occupied by the mercury vapour and the pressure would equal to the vapour pressure of mercury at its existing temperature. This almost vacuum condition above the mercury in the barometer is known as
Torricellian vacuum
.
What occupies the space above the mercury column in the barometer glass tube?
The space above the mercury column in a barometer is
torricellian vacuum
.
What can you conclude about the space above the mercury column?
The space in the tube above the mercury is
almost a vacuum
– it contains very little air. … The air pressure pushing down on the surface of the mercury in the dish is equal to the pressure exerted by the weight of the column of mercury in the tube.
Is there a vacuum in a mercury barometer?
When the finger is removed, the level of the mercury inside the tube drops until the pressure at the bottom of the column of mercury is equal to the pressure exerted by the surrounding air. Since no air was allowed to enter the tube,
the empty space above the mercury column is a vacuum
.
How does air pressure affect life on Earth?
As
the pressure decreases
, the amount of oxygen available to breathe also decreases. … Atmospheric pressure is an indicator of weather. When a low-pressure system moves into an area, it usually leads to cloudiness, wind, and precipitation. High-pressure systems usually lead to fair, calm weather.
Why vacuum is created in barometer?
The mercurial barometer consists of a glass tube, sealed at one end and filled with pure mercury. … After being heated to expel the air, it is inverted in a small cup of mercury called the cistern.
The mercury in the tube sinks slightly
, creating above it a vacuum (the Torricellian vacuum).
What test would be made to find out whether such a barometer has any gas in the space above the mercury?
If there is air trapped in the space above the mercury column then the barometer is faulty. This space above the mercury column is called
toricellian vacuum
. To test whether this space has some air trapped, the test tube is tilted until it is at the same level with the mercury column when the tube is upright.
What height of water is atmospheric pressure?
Standard atmospheric pressure supports
33.0 ft
of water and 760 mm of mercury.
Is the top of a barometer a vacuum?
The top of the
barometer is filled with nothing (vacuum)
because the mercury must have the space to expand and contract without any other force affecting it; a gas or liquid in the top would have its own pressure against the mercury and give inaccurate readings.
What is in the space at the top of the tube in the barometer?
The barometer is filled with mercury. The top of the barometer is filled with
the vacuum
because the mercury must have enough space to expand and contract without the other force acting on it.
What occupies the space above the HG column in the glass tube?
The space in the tube above the mercury is
nearly a vacuum
; only a negligible amount of mercury vapor occupies it. FIGURE 10.2 Mercury barometer invented by Torricelli. The mercury surface in the dish experiences the full force, or weight, of Earth's atmosphere.
How will the height of the mercury column change when the atmospheric pressure decreases?
Atmospheric Pressure and Altitude
At sea level, a mercury column will rise a distance of
760 mm
. This atmospheric pressure is reported as 760 mmHg (millimeters of mercury). At higher altitudes, the atmospheric pressure is decreased and so the column of mercury will not rise as high.
Why the level of mercury falls in a barometer while taking it to a mountain?
As the atmospheric pressure rises or falls so the mercury level in the tube rises or falls. … Up a mountain the
air pressure is low
and so the barometer reading will go down. Any air above the mercury in the tube will actually push the mercury down so giving a low reading for the atmospheric pressure.
What is the pressure of mercury?
Standard sea-level pressure, by definition, equals 760 mm (29.92 inches) of mercury,
14.70 pounds per square inch
, 1,013.25 × 10
3
dynes per square centimetre, 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals.
