Words nearby mercury barometer
MORE ABOUT MERCURY BAROMETER
What does mercury barometer mean?
A barometer is an instrument for measuring atmospheric pressure, which is used in forecasting the weather.
Mercury barometers are no longer in wide use, having been replaced by other methods of measuring pressure, such as aneroid barometers, which use a small capsule with flexible walls that expand or contract in response to changes in atmospheric pressure.
Why is mercury barometer important?
The mercury barometer was invented by Italian physicist and mathematician Evangelista Torricelli. He developed it in the mid-1640s after a suggestion from his mentor, the astronomer and physicist Galileo Galilei. French scientist Blaise Pascal later expanded on the fluid mechanics that Torricelli observed and used the mercury barometer to confirm that atmospheric pressure changes with altitude.
How can a bit of mercury predict the pressure of the atmosphere? The answer lies in the density of mercury and the ability to create a vacuum. A vacuum is an area of extremely low pressure. A vacuum can be created by filling a glass tube (such as a test tube) with some mercury and placing it top-down in a tub containing more mercury. The mercury in the tube presses down on itself and tries to flow out into the container. Pressure from the atmosphere presses on the mercury in the tub, and that forces the mercury up into the tube. Greater atmospheric pressure makes more of the mercury from the tub go into the tube, meaning the mercury goes higher, while less atmospheric pressure means less of the mercury gets forced into the tube and the level stays lower. You could do this with any liquid, but mercury’s high density compared to air means that you can use a tube that’s not too big.
Mercury barometers have fallen out of use because we’ve developed more accurate ways of measuring atmospheric pressure. That’s probably for the best, because mercury is very toxic. Although mercury barometers are now outdated as scientific instruments, they were a very important part of the history of science, helping to pave the way for improved weather forecasting and the field of meteorology.
Did you know ... ?
Evangelista Torricelli, the inventor of the mercury barometer, has a unit of pressure named after him. That’s the torr, defined as 1/760th of a standard atmosphere, which is a unit of measure equal to 101,325 pascals (yep, they’re named after Blaise Pascal).
What are real-life examples of mercury barometer?
Mercury barometers are no longer commonly used in scientific studies, but they are an important part of the history of science and meteorology.
Our fellow, Dr Oday, holding a mercury barometer, that’s > 40 year-old and we used to measure ambient pressure in our PFT lab @InterfaithMed. No one is using a mercury barometer anymore in this digital world @accpchest #CHESTChallenge2019 pic.twitter.com/ZprLTsAtJX
— Osama Mukhtar, MD, MRCP(UK) (@osamame) April 25, 2019
Our scientific instrument specialist has just moved in downstairs, everything from vintage medicine bottles to this superb mercury barometer
— Gloucester Antiques (@glosantiquesltd) May 7, 2017
What other words are related to mercury barometer?
True or False?
Mercury is used in mercury barometers due to its density.
How to use mercury barometer in a sentence
According to Wynd, “Freddie Mercury once said he wanted to lead a Victorian life surrounded by exquisite clutter.”Dodo Bones and Kylie’s Poo: Inside London’s Strangest New Museum|Liza Foreman|November 11, 2014|DAILY BEAST
He was demoted at the Mercury News, and left the paper in 1997.Jeremy Renner Opens Up About Marriage, His Problems with the Media, and the Future of Hawk-Eye|Marlow Stern|September 29, 2014|DAILY BEAST
Now, many of your films have aged really well, which I think is the true barometer for success.Juliette Lewis on Hollywood, Why the MSM Hates Scientology, and Masturbating to George Clooney|Marlow Stern|September 19, 2014|DAILY BEAST
In an interview with the San Jose Mercury News, Shi described one unwelcome encounter with Zhang.Yahoo’s Accused Sexual Harasser Asked Women to Wear More Skirts at Work|Olivia Nuzzi|July 14, 2014|DAILY BEAST
That means most of these planets orbit closer than Mercury does to the Sun.
These have canted bay windows below them, and their pediments are surmounted by figures representing Mercury and Athæne.Showell's Dictionary of Birmingham|Thomas T. Harman and Walter Showell
But the day he planned to start was very cold—the mercury stood twenty-seven below zero.The Homesteader|Oscar Micheaux
Bang went the fragile bulb, as it splintered into a thousand atoms, and the mercury shot in sparkling globules over the table.The Pit Town Coronet, Volume I (of 3)|Charles James Wills
Might not the sudden fall of the barometer before storms be from a cause similar in some degree to this?
I found it on all occasions extremely sensible, and very often to predict a change of wind much sooner than the barometer.