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Following are the reasons why Mercury and not water is used in a barometer:
1. Mercury is relatively denser than water, consequently the length of the column of water would have to be about 34 feethigh to exert pressure equal to that of the atmosphere while the column of mercury need to be only 30 inches to exert pressure equal to that of the atmosphere.
2. Mercury has a very low vapor pressure when compared to that of water. So it is more sensitive than water to the changes in the atmospheric pressure and rises more quickly to record the changes in the atmospheric pressure.
3. Mercury's freezing point is much lower than that of water's so it can record the atmospheric pressure at temperatures below that of 0 degrees centigrade.
4. Mercury does not evaporate easily so very little mercury vapor enters the vacuum above the mercury in the tube.
5. Mercury being a metal shines brightly and so can be used to read the markings on the tube easily.
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoIt would evaporate
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What deos a barometer measure?
A barometer is used to measure air pressure. It measures the atmospheric pressure using air, mercury, or water and will be shown as inches of mercury or millibars.
What is a barometer what does it do?
a barometer is a tool used to detect the air pressure
When would the barometer be used?
The most commonly barometer used today would be a Aneroid.
What is the most commonly used barometer?
The most commonly used barometer is the mercury barometer.However, it is not easy to transport but it gives more accurate results. Another type of barometer is Aneroid barometer which is easy to transport and handle.
Water is not used as barometric liquid?
Mercury is having a higher specific density ( about 13 times that of water) . So if we want to make a barometer using water it should be at least 13 times the length of mercury barometer that is about 11m so it is advisable to use mercury as a barometric liquid.
Can a barometer be used to measure the flow of water?
No, a barometer measures pressure.
A barometer is an instrument used for measuring water pressure?
otherwise know as a barometer and it measures air pressure in newtons
How was Stonehenge used as a barometer?
It was not used as a barometer.
What deos a barometer measure?
A barometer is used to measure air pressure. It measures the atmospheric pressure using air, mercury, or water and will be shown as inches of mercury or millibars.
Is used to measure the amount of the water vapor in the atmosphere?
barometer/hygrometer/thermometer
Air pressure is typically measured with a?
Air pressure is measured with a barometer.
What is an example of a sentence using the word barometer?
The barometer measures atmospheric pressure.
What is called the barometer of a circle?
A barometer is an instrument used to measure atmospheric pressure. A circle does not have a barometer!
What is the importance of barometer?
barometer is used to measure air pressure
What is a barometer what does it do?
a barometer is a tool used to detect the air pressure
When would the barometer be used?
The most commonly barometer used today would be a Aneroid.
What is the most commonly used barometer?
The most commonly used barometer is the mercury barometer.However, it is not easy to transport but it gives more accurate results. Another type of barometer is Aneroid barometer which is easy to transport and handle.
