Last edited by Vudojar
Monday, August 3, 2020 | History

3 edition of Mercury barometers and manometers found in the catalog.

Mercury barometers and manometers

W. G. Brombacher

Mercury barometers and manometers

by W. G. Brombacher

  • 375 Want to read
  • 40 Currently reading

Published by U.S. Dept. of Commerce, Nat"l Bureau of Standards in Washington .
Written in English

    Subjects:
  • Manometers.,
  • Barometer.

  • Edition Notes

    Bibliography: p. 45-46.

    Statement[by] W. G. Brombacher, D. P. Johnson, and J. L. Cross.
    SeriesNational Bureau of Standards monograph 8, NBS monograph ;, 8.
    Classifications
    LC ClassificationsQC190 .U556 no. 8
    The Physical Object
    Paginationiv, 59 p.
    Number of Pages59
    ID Numbers
    Open LibraryOL5814716M
    LC Control Number60061406
    OCLC/WorldCa699965

    BEING SURE THE BAROMETER IS WORKING. The height of the column of mercury inside its glass tube is affected by many things that can cause the barometer to give "inaccurate" readings, but before you can determine what your barometer is trying to tell you, you will have to know if the barometer is working at all or if the mercury system has a fault, and precisely what sort of a reading you are. I know that I can fill three banjo or open-cistern stick barometers' mercury systems with one pound of mercury, so each instrument contains about ounces ( grams). I have a banjo barometer on the wall at home that I last serviced about fifteen years ago, and in those 15 years there have been weeks of exposure (52 of those 7-day weeks.

    I want to continue my discussion of fluid of statics now by turning to applications of the hydrostatic pressure equation to manometers and barometers. Firstly, barometers are devices which have long been used to measure atmospheric pressure. And typically we do this by measuring the height of a column of a fluid, which is typically mercury. Mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, and other devices though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being largely phased out in clinical environments in favor of alcohol-filled, galinstan-filled, digital, or thermistor.

    A classic mercury barometer is constructed from a 3-foot glass tube that is open at one end and sealed at the opposite end. The glass tube is filled with liquid mercury and rests upside-down in a reservoir of mercury. As the mercury moves down the glass tube, a vacuum is created. Unfortunately most chemistry books have not kept up with the times and still refer only to measurements made with mercury barometers and manometers. They also, almost uniformly use units of mm of Hg, rather than the proper unit of Torr (1 Torr = 1 mm Hg), or even better bar.


Share this book
You might also like
Achieving harmonious industrial relations

Achieving harmonious industrial relations

Sea thrift

Sea thrift

On the upper limit of distance to which the arrangement of stars in space can at present be determined with some confidence

On the upper limit of distance to which the arrangement of stars in space can at present be determined with some confidence

Extracts from general report on survey of Katherine-Darwin Region, 1946

Extracts from general report on survey of Katherine-Darwin Region, 1946

78: best Canadian stories

78: best Canadian stories

The unpublished and uncollected letters

The unpublished and uncollected letters

Hungarian literature in English translation published in Great Britain, 1830-1968

Hungarian literature in English translation published in Great Britain, 1830-1968

To print 100,000 copies of an article on antityphoid vaccination in the Army and in civil life..

To print 100,000 copies of an article on antityphoid vaccination in the Army and in civil life..

IRS accounts receivable inventory

IRS accounts receivable inventory

Multi-product firms and trade liberalization

Multi-product firms and trade liberalization

Microsoft Office 2010

Microsoft Office 2010

Business line

Business line

struggle for judicial supremacy

struggle for judicial supremacy

Mercury barometers and manometers by W. G. Brombacher Download PDF EPUB FB2

UNITEDSTATESDEPARTAIEXTOFCOMAIERCE• r,Secret, ,Director MercuryBarometersandManometers cher,D.P. Additional Physical Format: Online version: Brombacher, W.G. (William George), Mercury barometers and manometers (OCoLC) Document Type. 8. U-tube barometers are U-tube manometers in which the pressure on one liquid surface, usually mercury, is maintained at essentially zero pres-sure, as by evacuating the space above the tube and sealing the tube.

Cistern barometers or manometers are those in which the diameter of one mercury column is much larger than the other to provide a Cited by:   The vacuum above the mercury column can be maintained by the use of a vacuum pump, which can produce a vacuum better than the accuracy required for portable barometers.

These pumps are operated while the barometer is being used. For standard barometers and where high pre-cision in absolute pressure measurement is desired,Cited by: Additional Physical Format: Print version: Brombacher, W.G.

(William George), Mercury barometers and manometers. Washington, U.S. Dept. of Commerce, Nat'l Bureau. Mercury is more dense.

Its relative density is times that of water. So, to measure the atmospheric pressure, which is mm of mercury you need a barometer,with mercury, of length. Mercury barometers are of two general categories: Fortin and Kew. In a Fortin barometer, the mercury surface in a cistern adjusted to a fixed point prior to taking a reading – this category also includes U tube manometers.

Mercury levels are measured from top of meniscus. Historically, mercury barometers were used with a variety of standard gravities and temperature depending on the field.

A barometer is a scientific instrument that is used to measure air pressure in a certain environment. Pressure tendency can forecast short term changes in the weather. Many measurements of air pressure are used within surface weather analysis to help find surface troughs, pressure systems and frontal boundaries.

Barometers and pressure altimeters (the most basic and common type of altimeter. Barometer, device used to measure atmospheric pressure. Because atmospheric pressure changes with distance above or below sea level, a barometer can also be used to measure altitude.

There are two main types of barometers: mercury and aneroid. Learn more about barometers in this article. Here are examples of the use of a manometer and a barometer in aviation: A manometer measures the pressure of the air facing the heading of an aircraft.

It is called, a pitot tube. It is then compared to another tube at right angle that is called. PerfectPrime ARP2, Digital Air Pressure Manometer to Measure Gauge & Differential out of 5 stars AAB SPM-K1 Wireless Smartphone Manometer and Probe Kit Combo.

out of 5 stars Manometer 11 Unit of Pressure - Meters Digital Measurement Maximum 10 PSI Data Hold & Error out of 5 stars   Manometers. A manometer is a device that measures pressure, typically atmospheric pressure.

Manometers have been used for centuries and come in a variety of designs, from older glass tubes containing mercury or water to new digital devices. Barometers.

Like a manometer, a barometer also measures atmospheric pressure. In fact, a barometer is a type of close-end manometer.5/5(1). Manometer Pressure Problems, Introduction to Barometers - Measuring Gas & Atmospheric Pressure - Duration: The Organic Chemistry Tu views The classic mercury barometer is designed as a glass tube about 3 feet high with one end open and the other end sealed.

The tube is filled with mercury. This glass tube sits upside down in a container, called the reservoir, which also contains mercury. The mercury level in the glass tube falls, creating a Author: Jenny Worboys. Mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lamps and other devices, though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being largely phased out in clinical environments in favor of alternatives such as Group: group Other articles where Mercury barometer is discussed: barometer: In the mercury barometer, atmospheric pressure balances a column of mercury, the height of which can be precisely measured.

To increase their accuracy, mercury barometers are often corrected for ambient temperature and the local value of gravity.

Common pressure units include pounds per square inch; dynes per. Barometers. Manometers typically use a U-shaped tube of a fluid (often mercury) to measure pressure. A barometer (Figure \(\PageIndex{3}\)) is a device that typically uses a single column of mercury to measure atmospheric pressure.

The barometer, invented by the Italian mathematician and physicist Evangelista Torricelli (–) in   A mercury barometer is a device that uses the various physical properties of mercury contained in a tube to measure barometric pressure, also known as air pressure or atmospheric s in pressure are used to predict imminent weather changes, so barometers are useful tools for weather forecasting.

When the barometric pressure drops, for example, it is possible that. Mercury is a hazardous and toxic substance and is subject to regulations in many locations. However, here are some interesting documents regarding mercury barometers.

I take no responsibility for anyone who chooses to own or handle mercury. Proceed at your own risk. Thus, EPA has determined that any manufacturing or processing of elemental mercury for use in barometers, manometers, or hygrometers or psychrometers is a significant new use, except for mercury use in barometers, manometers, hygrometers, and psychrometers that were in service prior to May 6, ; and in portable, battery-powered, motor.

Barometers. Manometers typically use a U-shaped tube of a fluid (often mercury) to measure pressure. A barometer (see Figure ) is a device that typically uses a single column of mercury to measure atmospheric barometer, invented by the Italian mathematician and physicist Evangelista Torricelli (–) inis constructed from a glass tube closed at one end and.Manometers and Barometers The piece of lab equipment specifically designed to measure the pressure of gases is known as the barometer.

A barometer uses the height of a column of mercury to measure gas pressure in millimeters of mercury or torr (1 mmHg = 1 torr). The simplest kind of barometer is a tall closed tube standing upside down in a bath of mercury (a dense liquid metal at room temperature) so the liquid rises partly up the tube a bit like it does in a thermometer.

We use mercury in barometers because it's more convenient than using water. Water is less dense (less heavy, in effect) than mercury.