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.
The scale on an aneroid barometer between 28 and 31 typically represents atmospheric pressure in inches of Mercury (inHg) or millibars (mb). These units measure the pressure exerted by the Earth's atmosphere at a specific location.
It refers to the atmospheric pressure which, in this case, is measured in inches of mercury on a mercury barometer
To measure pressure in the air. Meteorologists use them (weather people) a barometer is used for measuring pressure,the units for measuring pressure include atm,pascal,torr,mm of hg,bars.
There are a lot of possible units. Many TV stations report pressure in inches of mercury, where standard sea level pressure = 29.92 inHg. You can also use millimeters of mercury, which is a simple conversion from inches of mercury (1 inch is about 25.4 mm). Atmospheric scientists usually use hectoPascals (hPa) or millibars (mb), which are the same numerically. Standard sea level pressure is 1013.25 hPa, or 1013.25 mb. 1 hectoPascal is equal to 100 Pascals, while 1 millibar is one-thousandth of a bar. A couple of less common units are Torrs, where sea level pressure is 760 Torr, or atmospheres, where standard sea level pressure = 1 atmosphere.
Celsius, also known as centigrade, is a scale and unit of measurement for temperature.... The Celsius scale is in general use wherever the metric system of units has been adopted.
You would use a scale to measure the mass of a load of dirt. Place the load on the scale and take the measurement in units such as kilograms or pounds.
The units of measurement for an aneroid barometer are typically in inches of mercury (inHg) or millibars (mb). These units represent the atmospheric pressure being measured by the instrument.
The answer to this question is, the Mercury and aneroid barometer
An aneroid barometer measures air pressure by using a small, flexible metal box called an aneroid cell. As the air pressure changes, the cell expands or contracts, which causes a needle to move on a dial indicating the pressure. This movement is calibrated to show the atmospheric pressure in units such as inches of mercury or millibars.
Just as a guess, they're probably inches of mercury. Standard air pressure is set at 29.92 inches of mercury.
Probably a mercury barometer and a aneroid barometer. -adrian
The answer to this question is, the Mercury and aneroid barometer
Mercury barometers are commonly used today due to their accuracy and reliability in measuring atmospheric pressure. However, digital and aneroid barometers are also popular for their portability and ease of use.
The altimeter is essentially an aneroid barometer that reads in units of altitude rather than pressure. This is possible by using the standard atmosphere to make the conversion from pressure to altitude.
Atmospheric pressure is commonly measured using a barometer. A mercury barometer measures pressure by the height of a mercury column in a glass tube, while an aneroid barometer uses a flexible metal box to detect pressure changes. Both types of barometers provide a numerical value in units such as millibars or inches of mercury.
The most usual devices are barographs and barometers. A barometer can work off an aneroid cell (eg digital aneroid barometer) or a column of mercury (eg Kew Pattern barometer). Barographs usually work off aneroid cells and through a linkage system print the pressure onto a chart (usually changed weekly although there are daily barometers as well). So the main difference is that a barometer gives a spot reading while the barograph is continuous, although it's possible for the readings from a digital barometer like one connected to an Automatic Weather Station to be saved and called up later, or even printed out in graph form. The usual unit for air pressure in meteorological circles is the hectoPascal (hPa) which replaced the millibar some years ago (the units have the same numerical value, though) except for the US which sticks with the old inches of mercury (InHg).
An aneroid barometer typically consists of a round dial with a needle pointing to the current atmospheric pressure in units such as inches of mercury or millibars. It often has a metal case with a transparent cover to display the dial and is compact in size making it suitable for home or office use.
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.