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A barometer is used to measure air pressure. A Mercury Barometer uses a column of liquid mercury supported by air pressure. The length of this liquid column gives a measure of the air pressure. Air pressure is commonly expressed in terms of "millimetres of mercury" (mmHg). Mercury is considered as a hazardous material and Mercury Barometers cannot be legally manufactured in Europe as of 2007. An Aneroid Barometer traditionally uses an evacuated corrugated metal canister that expands or contracts in response to changes in air pressure and this mechanical movement is amplified to indicate the air pressure in any required units on a calibrated display. The commonest pressure units displayed are in "millibars" (mbar). The latest Aneroid Barometers use a tiny evacuated capsule made of semiconducting materials that responds electrically to changes in air pressure, enabling very precise and repeatable measurement. The electrical signals from this device are processed electronically to provide a visual display of air pressure or to be recorded on a data-logging device as required.
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Types of Barometers?
anaeriod barometer and a mercury barometer
How are the Mercury and aneroid barometers alike?
mercury barometers and aneroid barometers both measure air pressure.
What are 2 types of barometers?
Mercury and aneroid barometers.
Does barometers contain Mercury?
Many do, but not all. Most barometers that people would have in their homes are aneroid barometers, which don't contain any mercury.
What do mercury barometers and aneroid barometer do?
They both measure air pressure, but in different ways
Why are mercury barometers no particle for use in altimeters?
because they are too large and clumsy to be used as altimeters so there replaced by aneroid
Why are aneroid barometers often more practical than mercury barometers?
The aneroid barometer is more durable and compact, and much easier to read. The only particular advantage of a mercury barometer is that it's a direct measurement -- there's no calibration involved. If you can measure the height of the column above the pool and you know the density of mercury, you have the pressure.
What led to the development of the aneroid barometer?
Evangelise Torricelli invented the mercury barometer in the 1600s. It was very accurate, but it was clumsy to move and had to stay upright. If humans hadn't invented the aneroid barometer, you would see big mercury barometers in all types of transportation.
What barometers are there?
There are two types of barometers, Mercury barometers and then Aenroid barometers.
Antique aneroid barometer has a scale of 28 to 31 what units are these?
A meterological type of barometer uses a column of mercury that is supported by atmosperic pressure. The height of this column varies with the atmospheric pressure and was at one time measured off in inches in the range of about 28 to 31 "inches of mercury". The scale now used is Millibars both in aneroid and mercury barometers.
Why is the fluid in a barometer rather than water or another liquid?
Because Mercury is heavier than water, therefore it takes more atmospheric pressure to make the mercury move. However, there are aneroid barometers, which don't have any fluid in them at all.
What type of barometer used in aircraft?
Aircraft use an Aneroid Barometer, which uses a bellows and spring to measure changes in the earth's atmosphere from air pressure, unlike mercury or water barometers which use a liquid to measure these changes.
