Why do denser liquids work better in barometers?
Thus in comparison with some other liquids, mercury gives considerably less height for the liquid rise in a tube of the barometer. Hence the higher density of the mercury is beneficial to lower the size of a barometer.
What is the preferred liquid in a barometer?
mercury In the barometer mercury is used as the barometric liquid. Mercury has many advantages when used as a measuring liquid in a barometer tube. Mercury has high density. Because of this property, when there is a change in pressure the change in height of the mercury in the barometer tube will be very reasonable.
Why is it difficult to use water as the liquid in a barometer?
Water is not a suitable barometric liquid because: (i) The density of water is low (103 kg m-3). Water barometer will support 10.4m of water at sea level. It is impractical to have such a long tube.
Why can’t we use water instead of mercury in barometer?
Mercury is the heaviest liquid. Therefore, it rises only to a height of 76cm to balance the atmospheric pressure. Water, being 13. 6 times lighter than mercury, will rise to a 13.
How does a liquid barometer work?
A water barometer is a device that uses water to measure barometric pressure. The device uses the force of gravity combined with pressure in the air to create a vacuum which in turn gives a reading that indicates the barometric pressure changes that are taking place in a specific area.
Why is mercury suitable as a barometric fluid?
Mercury is preferred to water as a barometric liquid because it is about 13.6 times denser than water. A water barometer will need to be quite bigger and taller than a mercury barometer in order to reasonably measure atmospheric pressure, so, for the sake of portability, a more denser liquid like mercury is preferred.
Which liquid is used in barometer and why?
Mercury is the liquid used in a barometer. Some of the properties that make it a suitable choice are listed below: High density: Smaller length of mercury (76 cm) can balance the atmospheric pressure. It is more sensitive to changes in pressure.
What is the reason that the weight of the object is less in water than in air?
However, since air is less dense than water, the bouyant force of air is less than that of water, so the object in air seems heavier.
Why mercury is used as barometric liquid?
Mercury flows easily. The density of mercury is less as compared to other fluids. Changes in mercury level are easier to detect.
How do you read a barometer with water?
Luckily, it's also simple to read. To determine the likely weather, you have only to see how high or low the water is in the glass. Look at the water in the spout of the barometer. If the water holds steady around the middle of the spout, you'll have good weather.
Can you measure water pressure with a barometer?
Many different types of barometers exist. One of them is the water-based barometer: water is sealed in a glass container with a narrow spout connecting the outside to the inside. When the outside air pressure increases it pushes onto the water in the spout, resulting in a water level decrease.
Does density affect pressure liquid?
As shown in the equation, the height of the column isn't the only thing that affects the pressure, the density of the liquid does too. As the density of the liquid increases, so does the pressure. If the liquid is open to the air, there will also be atmospheric pressure on its surface.
Why mercury is preferred over water as a barometric fluid?
The correct answer is Mercury has high density and low vapour pressure. Mercury is used in barometers and not water. This is because the high density of mercury gives a reasonable height of the column to measure atmospheric pressure.
What happens to the weight of the object when immersed in liquids with different densities?
If its average density is less than that of the surrounding fluid, it will float. This is because the fluid, having a higher density, contains more mass and hence more weight in the same volume. The buoyant force, which equals the weight of the fluid displaced, is thus greater than the weight of the object.
Why a man will be found lighter when weighed in air than in vacuum?
The apparent weight of body is less in air than in vacuum. This follows from Archimedes principle , which explains the loss in weight of a body immersed in a fluid, due to the upthrust . But in vacuum, there is no upthrust and hence no loss in wieght of a body. That is why a body weighs more in vacuum than in air .
What are the disadvantages of using water as a barometric liquid?
The use of water in a barometer has the following disadvantages :
- The density of water is low , so nearly 10.4 m height of water column is needed to balance the normal atmospheric pressure. …
- The vapour pressure of water is high, so the vapours in the vacuum space shall make the reading inaccurate.
Is water less dense than mercury?
(For more information about mercury, click here.) Mercury has a density of 13.5 g/mL, which is about 13.5 times denser than water (1.0 g/mL), so a small amount of mercury like this feels unexpectedly heavy.
How does a single fluid barometer work?
Here's how it works: Inside of an aneroid barometer is a small flexible metal box. Since this box has had the air pumped out of it, small changes in external air pressure cause its metal to expand and contract. The expansion and contraction movements drive mechanical levers inside which move a needle.
Why mercury is preferred as a barometric liquid?
Two advantages of using mercury as barometric liquid: (i) The density of mercury is greater than that of all the liquids, so only 0.76m height of mercury column is needed to balance the normal atmospheric pressure. (ii) The mercury neither wets nor sticks to the glass tube therefore it gives the correct reading.
How does density affect pressure?
When density increases, pressure increases. When density decreases, the pressure decreases.
Does density affect pressure drop?
However, if the fluid is gas, pressure drops and flow measurements do depend on the density of the gas, which is a function of pressure, molecular weight, and temperature. For the same mass flowrate, pressure drop increases as density decreases.
What will happen if an object less dense than the fluid is immersed in the fluid?
If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float.
How does density of fluid affect buoyancy?
Explain your answer. The buoyant force is equal to the weight of the fluid displaced. The greater the density of the fluid, the less fluid that is needed to be displaced to have the weight of the object be supported and to float.
How does density affect buoyancy?
Density is mass per unit volume. If an object is more compact, or denser, than water, it will sink in water. If the density of an object is less than the density of water, the object will float in water.
How is density related to buoyancy?
Buoyant force is directly proportional to the density of the liquid displaced. So, greater the density of the liquid, greater is the buoyant force due to the liquid.
Which liquid has the highest density Why?
Mercury has the highest density at standard temperature and pressure, Stay tuned with BYJU'S to learn more about other concepts such as the density of mercury. Was this answer helpful?
What is the densest liquid on Earth?
Mercury is the densest liquid at standard conditions for temperature and pressure (STP). Also called quicksilver, mercury has been known for more than 3,500 years.
What makes a barometer work?
The barometer works by balancing the weight of mercury in the glass tube against the atmospheric pressure, much like a set of scales.
Where is the best place for a barometer?
Hang the barometer in a location that works for you. Avoid a location that is exposed to direct sunlight as the temperature changes can affect the readings. Hang the barometer away from drafty locations, like near a door or a window. Air pressure is too variable in these locations.
How does density of liquid affect pressure?
As the density of the liquid increases, so does the pressure. If the liquid is open to the air, there will also be atmospheric pressure on its surface.