Though other liquids can be used in a barometer, mercury is the most common. Its density allows the vertical column of the barometer to be of manageable size. If water were used, for instance, the column would have to be 34 feet high.
Which liquid is used in barometer and why?
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.
What liquid did the first barometer use?
Mercury is commonly used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure. This is because mercury is 13.6 times more dense than water.
In which barometer no liquid is used?
The barometer has two major categories – mercury barometer and aneroid barometer . While in the former we make use of the mercury column to measure the pressure , no liquid is used in an aneroid barometer.
Why is water not used in barometer?
Water is not a suitable barometric liquid because: (i) The vapour pressure of water is high, so its vapours in the vacuum space will make the reading inaccurate . (ii) Water sticks with the glass tube and wets it, so the reading becomes inaccurate.
What is the most accurate barometer?
- BTMETER Digital Barometer.
- ThermoPro Digital Barometer.
- ThermoPro TP65A Digital Barometer.
- AcuRite 00795A2 Galileo Glass Globe Barometer.
- Lily’s Home Analog Weather Station Barometer.
Why is mercury’s barometric fluid better than water?
mercury is a better barometric fluid than water because i. it needs no colouring ii . its density is many times greater than that of water iii. it does not wet glass iv.
What liquid is used in an aneroid barometer?
Though other liquids can be used in a barometer, mercury is the most common. Its density allows the vertical column of the barometer to be of manageable size. If water were used, for instance, the column would have to be 34 feet high.
Can we use alcohol as a barometric liquid give reason?
In the barometer case the operating premise is that the atmospheric pressure must be compared to the vacuum pressure of the mercury column. ... The reason is that alcohol, unlike mercury, has a large vapor presure near room temperature .
Why water is not used in mercury barometer?
Explain why water cannot be used in place of mercury in a barometer? The atmospheric pressure at sea level = 76cm of Hg = 1.013×10 5 Pascal. That is, if water is used in barometer tube instead of mercury, the length of the tube must be greater than 10.326 cm . ... So, we cannot replace mercury by water in the barometer.
Can we use water in barometer?
Hence we can conclude that we cannot use water as a barometric liquid . Note: Water has very strong adhesive forces than cohesive forces. Hence it usually sticks to the surface of any given material until and unless it’s hydrophobic.
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.
Is pressure greater in salt water?
Salt water is denser than fresh water. Pressure will be greater beneath the salt water than the fresh water at the same depth. ... The pressure on an object submerged in a fluid does not depend on the surface area of the fluid or object.
Why mercury is used in barometer?
Mercury is employed in the barometer because its density is sufficiently high for a relative short column to be obtained . and also because it has very small vapour pressure at normal temperature. High density scales down the pressure head(h) to repesent same magnitude of pressure in a tube of smaller height.
What are the demerits of simple barometer?
- It is not transportable, that is, it is inconvenient to move from one place to another.
- There is no protection to the glass tube used in it.
- The container (trough) is open and hence there are chances of spilling and impurities getting mixed.
Who made the best barometers?
- Thomas 6530 – Best Digital Barometer for Home Use. ...
- Lily’s Home Analog Barometer GL08 – Best Barometer with Weather Station. ...
- AcuRite 00795A2 – Best Giftable Barometer. ...
- Thomas 4199 – Best Dial Barometer. ...
- Master-Mariner Barometer – Best Home Barometer. ...
- Fischer Instruments 1434B-22-B – Best Barometer for Durability.
