what device is used to measure atmospheric pressure

barometer

barometer

A barometer is a tool used to mensurate atmospheric pressure, also called barometric pressure

Subjects

Earth Scientific discipline, Meteorology

Contents

9 Images, i Video, i PDF

Atmospheric pressure level is an indicator of atmospheric condition. Changes in the temper, including changes in air pressure, affect the weather. Meteorologists utilise barometers to predict short-term changes in the weather condition.

A rapid driblet in atmospheric pressure means that a low-pressure level system is arriving. Low pressure means that there isn't plenty force, or pressure, to push clouds or storms away. Depression-pressure systems are associated with cloudy, rainy, or windy weather. A rapid increase in atmospheric pressure pushes that cloudy and rainy weather condition out, clearing the skies and bringing in cool, dry air.

A barometer measures atmospheric pressure in units of measurement called atmospheres or bars. An atmosphere (atm) is a unit of measurement equal to the average air pressure level at sea level at a temperature of 15 degrees Celsius (59 degrees Fahrenheit).

The number of atmospheres drops every bit altitude increases because the density of air is lower and exerts less pressure. As altitude decreases, the density of air increases, as does the number of atmospheres. Barometers have to exist adjusted for changes in altitude in order to make accurate atmospheric pressure level readings.

Types of Barometers

Mercury Barometer

The mercury barometer is the oldest type of barometer, invented past the Italian physicist Evangelista Torricelli in 1643. Torricelli conducted his showtime barometric experiments using a tube of water. Water is relatively light in weight, and then a very tall tube with a large amount of h2o had to be used in order to compensate for the heavier weight of atmospheric pressure level.

Torricelli'south water barometer was more than 10 meters (35 feet) in pinnacle, which rose above the roof of his domicile! This odd device caused suspicion among Torricelli'due south neighbors, who thought he was involved in witchcraft. In order to go on his experiments more secretive, Torricelli deduced that he could create a much smaller barometer using mercury, a silvery liquid that weighs 14 times every bit much as water.

A mercury barometer has a glass tube that is closed at the height and open up at the bottom. At the bottom of the tube is a puddle of mercury. The mercury sits in a circular, shallow dish surrounding the tube. The mercury in the tube will arrange itself to match the atmospheric force per unit area above the dish. As the pressure increases, information technology forces the mercury up the tube. The tube is marked with a serial of measurements that track the number of atmospheres or confined. Observers can tell what the air force per unit area is by looking at where the mercury stops in the barometer.

Aneroid Barometer

In 1844, the French scientist Lucien Vidi invented the aneroid barometer. An aneroid barometer has a sealed metal chamber that expands and contracts, depending on the atmospheric pressure around it. Mechanical tools measure how much the chamber expands or contracts. These measurements are aligned with atmospheres or bars.

The aneroid barometer has a circular display that indicates the present number of atmospheres, much similar a clock. One hand moves clockwise or counterclockwise to point to the current number of atmospheres. The terms stormy, pelting, modify, fair, and dry are oftentimes written above the numbers on the dial face to make it easier for people to translate the weather. Aneroid barometers slowly replaced mercury barometers because they were easier to utilise, cheaper to buy, and easier to send since they had no liquid that could spill.

Some aneroid barometers use a mechanical tool to rails the changes in atmospheric force per unit area over a period of time. These aneroid barometers are called barographs. Barographs are barometers connected to needles that make marks on a roll of side by side graph paper. The barograph records the number of atmospheres on the vertical axis and units of time on the horizontal. A barograph's tracking tool will rotate, normally in one case every mean solar day, week, or month. The spikes in the graph testify when air pressure was high or low, and how long those force per unit area systems lasted. A astringent tempest, for instance, would announced as a deep, wide dip on a barograph.

Digital Barometers

Today's digital barometers mensurate and display circuitous atmospheric data more accurately and quickly than e'er before. Many digital barometers brandish both current barometric readings and previous 1-, 3-, half dozen-, and 12-hour readings in a bar chart format, much similar a barograph. They likewise account for other atmospheric readings such as wind and humidity to make accurate weather forecasts. This information is archived and stored on the barometer and can too be downloaded onto a computer for farther analysis. Digital barometers are used past meteorologists and other scientists who want upward-to-appointment atmospheric readings when conducting experiments in the lab or out in the field.

The digital barometer is at present an important tool in many of today's smartphones. This type of digital barometer uses atmospheric force per unit area data to make accurate elevation readings. These readings aid the smartphone's GPS receiver pinpoint a location more accurately, profoundly improving navigation.

Developers and researchers are besides using the smartphone'south crowdsourcing capabilities to make more accurate weather forecasts. Apps like PressureNet automatically collect barometric measurements from each of its users, creating a vast network of atmospheric data. This data network makes it easier and faster to map out storms as they develop, specially in areas with few conditions stations.

Vocabulary

Term	Part of speech	Definition
accurate	adjective	exact.
adjacent	describing word	next to.
adjust	verb	to change or modify something to fit with something else.
air	noun	layer of gases surrounding World.
air pressure	noun	force pressed on an object by air or atmosphere.
align	verb	to put in a straight line.
altitude	noun	the distance to a higher place sea level.
analysis	noun	process of studying a problem or situation, identifying its characteristics and how they are related.
aneroid barometer	noun	tool that determines atmospheric pressure by measuring how much a metal chamber expands or contracts.
app	noun	(awarding) specialized program downloaded onto a mobile device.
archive	verb	to continue records or documents.
associate	verb	to connect.
atmosphere	noun	layers of gases surrounding a planet or other celestial body.
atmosphere (atm)	substantive	(atm) unit of measurement of measurement equal to air pressure at ocean level, about xiv.7 pounds per foursquare inch. Also called standard atmospheric pressure.
atmospheric pressure	noun	force per unit area exerted by the mass of the atmosphere as gravity pulls it to World.
centrality	noun	an invisible line around which an object spins.
bar	noun	(b) unit for force per unit area; i bar is almost equal to the atmospheric pressure level at sea level.
barograph	noun	barometer that tracks changes in atmospheric force per unit area over time.
barometer	noun	an instrument that measures atmospheric force per unit area.
barometric force per unit area	noun	atmospheric pressure equally read by a barometer.
bedchamber	noun	sealed compartment.
cloud	substantive	visible mass of tiny h2o droplets or ice crystals in Earth's temper.
recoup	verb	to make up for a loss or injury, usually in money, goods, or services.
complex	adjective	complicated.
conduct	verb	to transmit, transport, or conduct.
contract	verb	to shrink or become smaller.
crowdsourcing	substantive	technique that enlists the public to assistance with a specialized task.
data	plural substantive	(atypical: datum) information nerveless during a scientific report.
decrease	verb	to lower.
deduce	verb	to reach a conclusion based on clues or show.
density	noun	number of things of one kind in a given surface area.
digital	adjective	having to practise with numbers (or digits), frequently in a format used past computers.
display	verb	to show or reveal.
tiptop	noun	height above or beneath body of water level.
Evangelista Torricelli	noun	(1608-1647) Italian physicist.
exert	verb	to strength or pressure.
expand	verb	to abound or go larger.
forecast	verb	to predict, especially the conditions.
GPS receiver	noun	device that gets radio signals from satellites in orbit above Earth in order to calculate a precise location.
graph paper	noun	paper marked with pocket-size boxes, or intersecting horizontal and vertical lines.
gravity	noun	physical force past which objects attract, or pull toward, each other.
horizontal	adjective	left-correct management or parallel to the World and the horizon.
humidity	noun	amount of water vapor in the air.
indicate	verb	to display or show.
instrument	substantive	tool.
interpret	verb	to explicate or sympathize the meaning of something.
invent	verb	to create.
depression-pressure organisation	noun	weather blueprint characterized past low air pressure, usually as a result of warming. Low-pressure systems are frequently associated with storms.
measurement	noun	process of determining length, width, mass (weight), book, distance or some other quality or size.
mercury	noun	chemic element with the symbol Hg.
mercury barometer	noun	tool that determines atmospheric pressure by measuring how much mercury moves in a glass tube.
metal	noun	category of elements that are usually solid and shiny at room temperature.
meteorologist	substantive	person who studies patterns and changes in Earth's atmosphere.
navigation	noun	art and science of determining an object'south position, course, and altitude traveled.
network	noun	series of links forth which movement or communication tin take place.
observer	substantive	someone who watches, or observes.
physicist	noun	person who studies the relationship between matter, energy, motion, and strength.
predict	verb	to know the outcome of a state of affairs in advance.
pressure	noun	force pressed on an object past another object or condition, such as gravity.
previous	describing word	earlier, or the one before.
rain	noun	liquid precipitation.
rapid	adjective	very fast.
rotate	verb	to turn effectually a center point or axis.
sea level	noun	base level for measuring elevations. Sea level is determined by measurements taken over a 19-year bike.
smartphone	substantive	mobile telephone with additional features, such every bit a web browser or music playing device.
storm	noun	severe weather indicating a disturbed state of the temper resulting from uplifted air.
storm drinking glass	noun	glass container filled with water or another liquid that responds to changes in atmospheric pressure.
suspicion	noun	doubt or mistrust.
temperature	noun	degree of hotness or coldness measured by a thermometer with a numerical scale.
ship	verb	to move fabric from 1 identify to some other.
vast	describing word	huge and spread out.
vertical	noun	up-down direction, or at a right bending to Earth and the horizon.
weather	substantive	state of the atmosphere, including temperature, atmospheric pressure, wind, humidity, precipitation, and cloudiness.
weather station	noun	expanse with tools and equipment for measuring changes in the temper.
current of air	substantive	movement of air (from a high pressure zone to a low pressure zone) caused by the uneven heating of the Globe by the lord's day.
witchcraft	substantive	changing of everyday events using supernatural or magical powers.

© 1996–2022 National Geographic Society. All rights reserved.

cesarwhoint48.blogspot.com

Source: https://www.nationalgeographic.org/encyclopedia/barometer/print/#:~:text=A%20barometer%20is%20a%20scientific,Barometers%20measure%20this%20pressure.

Share this post