What will happen to the height of mercury column in a barometer if small hole is made in the glass tube above the mercury column Why?

So the height of the column of mercury shortens. A meteorologist would say the barometer was falling, meaning the mercury column was going down as in this picture.

Why is there a vacuum at the top of a barometer?

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 holds up the mercury in the tube?

atmospheric pressure
The mercury is in a long glass tube with an open reservoir at the bottom: higher atmospheric pressure exerts a downward force on the mercury in the reservoir – and pushes the mercury up the tube.

What happens to the level of the mercury in the glass tube of a mercury filled barometer when the air pressure increases?

If the weight of mercury is less than the atmospheric pressure, the mercury level in the glass tube rises (high pressure). In areas of high pressure, air is sinking toward the surface of the earth more quickly than it can flow out to surrounding areas.

What happens when there is a hole in the barometer?

In a mercury barometer, if we make a hole in the portion above the level of mercury, then the mercury level in the column drops and ultimately all the mercury in the column goes into the reservoir below or if it’s capacity is not large enough it overflows.

How will the barometric height be affected if mercury was replaced by water in simple barometer?

Answer: . The column of water inside the barometer would be 13,6 times higher, since the density of mercury is 13,6 times that of water.

How is a vacuum created in a 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).

How is a vacuum formed in barometer?

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.

How do you get air bubbles out of a mercury barometer?

Turn the tube upside down and “pump, jiggle or gently tap” the tube on a hard surface. The mercury will push pas the air locks, forcing them upward towards the open end of the tube. 3. When all the air is out or near the bend in the tube, invert the tube to its normal position.

How does inches of mercury work?

Inch of mercury (inHg and ″Hg) is a unit of measurement for pressure. In older literature, an “inch of mercury” is based on the height of a column of mercury at 60 °F (15.6 °C). 1 inHg60 °F = 3,376.85 pascals (33.7685 hPa) In Imperial units: 1 inHg60 °F = 0.489 771 psi, or 2.041 771 inHg60 °F = 1 psi.

What causes mercury to move up and down in a barometer?

Simply put, a barometer acts like a balance that ‘balances’ the weight of the atmosphere (or air around you) against the weight of a mercury column. If the air pressure is high, the mercury will rise. At low air pressure, the mercury goes down.