mercury column

Pressure can be measured using an aneroid, Bourdon tube, mercury column, or various other methods.

The pressure sensors were calibrated before and after each recording with mercury columns of zero and 250 mm.

Clearly tubes F and D must be long enough to support mercury columns corresponding to atmospheric pressure (76 cm at sea level).

If a fine platinum wire is in the capillary tube, its resistance indicates the height of the mercury column around it.

The resulting torsional wave would then move down the wire just as the sound wave did down the mercury column.

The design of a McLeod gauge is somewhat similar to a that of a mercury column manometer.

His stage name derives from his days taking part in DJ contests, where a mercury column would gauge audience reaction.

Mercury in the tube adjusts until the weight of the mercury column balances the atmospheric force exerted on the reservoir.

The volume of mercury changes slightly with temperature; the small change in volume drives the narrow mercury column a relatively long way up the tube.

Instant start fluorescent tubes simply use a high enough voltage to break down the gas and mercury column and thereby start arc conduction.

Some models also employ a valve for closing the cistern, enabling the mercury column to be forced to the top of the column for transport.

His voltmeter, brought from Montrouge, was a needle cantilevered to a pivoting electromagnet coil with a mercury column resistor.

The Six's thermometer is notoriously known for separations in the mercury column, in particular after shipment, though accidental knocks have been known causes as well.

(These two pressures are not pressures in the usual sense - they cannot be measured using an aneroid, Bourdon tube or mercury column.)

His J-tube thermometers comprised a mercury column that was supported by a fixed mass of air entrapped within the sensing portion of the thermometer.

The mercury column was required because vacuum pumps of the time could not provide the high vacuum needed to operate a carbon emitter for a practical duration.

One proposal was to devise a unit based on a mercury column that would be coherent - in effect, adjusting the length to make the resistance one ohm.

Hydrostatic gauges (such as the mercury column manometer) consist of a vertical column of liquid in a tube whose ends are exposed to different pressures.

Hydrostatic gauges (such as the mercury column manometer) compare pressure to the hydrostatic force per unit area at the base of a column of fluid.

The mercury column standard was maintained until the 1948 General Conference on Weights and Measures, which redefined the unit in absolute terms instead of as an artifact standard.

The mercury column method of realizing a physical standard ohm turned out to be difficult to reproduce, owing to the effects of non-constant cross section of the glass tubing.

It consists of a conventional bulb connected to a capillary in which a constriction is placed so that upon reversal the mercury column breaks off in a reproducible manner.

He looks uphill and sees a rain of silver globules bouncing and rolling down the deckplates toward him: the mercury columns that they use to measure pressure must have been ruptured.

It was defined by Werner von Siemens as the resistance of a mercury column 1 metre long and uniform 1 mm cross sectional area at 0 degrees Celsius.

The most important advantage of mercury over oil, is that a fair amount of pressure can be maintained within the inert gas system (equivalent to the height of the mercury column).