A Mercury barometer is a device that measures air pressure. The key component that distinguishes it from other barometers is the metal mercury.
A mercurial barometer was based on a principle that was developed by Evangelista Torricelli in 1643. It is a instrument that is used form measuring the change in atmospheric pressure.
Maybe you mean what does a mercury barometer measure. In which case the answer is atmospheric pressure.
When air pressure increases, the mercury in a barometer rises.
Air is "pushed" into the open end of a barometer when the pressure is higher, meaning the mercury closer to the closed end of the barometer - where the pressure is measured - will rise.
The space above the mercury is airtight, there is no air above the mercury
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.
A mercury barometer.
anaeriod barometer and a mercury barometer
Mercury barometer precaution
Mercury
The first barometer that was invented was the MERCURY barometer. a mercury barometer consists of a glass tube open at the bottom end and partially filled with mercury. (:
barometer has mercury inside it .
One statement to accurately describe a difference between a mercury barometer and an aneroid barometer is that a mercury barometer is a closed tube containing mercury. An aneroid barometer is a closed, flexible container of gas.
A Mercury barometer is used to measure atmospheric pressure.
Maybe you mean what does a mercury barometer measure. In which case the answer is atmospheric pressure.
Good question.Look at it like this if you had two barometers side by side, one a mercury barometer and the other a barometer that reacted to changes in air pressure using some bellows and a spring.Then, as the pressure changed you marked the second barometer positions and noted on the dial the inches reading from the mercury barometer, the second barometer measurement scale would mimic the real mercury barometer even though it did not actually use any mercury.
To measure the local pressure of the Earth's atmosphere, Torricelli invented the first Mercury Barometer.
A barometer is a closed-system vacuum that allows the mercury to expand with changes in temperature and pressure.