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Barometer: An instrument used to measure atmospheric pressure. Two examples are the aneroid barometer and the mercurial barometer.

Mercurial Barometer: An instrument used for measuring the change in atmospheric pressure. It uses a long glass tube, open at one end and closed at the other. After first filling the open end with mercury, it is . . . View Full Definition

Aneroid Barometer: An instrument for measuring the atmospheric pressure. It registers the change in the shape of an evacuated metal cell to measure variations on the atmospheric pressure. The aneroid is a thin . . . View Full Definition

January Barometer: A statistic from 'The Stock Traders Alamanac' reflecting, with 88% accuracy, that the overall stock market rises in a year when the S&P is up in the month of January and drops when the index . . . View Full Definition

Inverse Barometer Effect: The inverse response of sea level to changes in atmospheric pressure. A static reduction of 1.005 mb in atmospheric pressure will cause a stationary rise of 1 cm in sea level.

Atmosphere (Atm): A unit of pressure, equal to a barometer reading of 760 mm Hg. 1 atmosphere is 101325 pascals and 1.01325 bar.

Torr: A unit of pressure, defined so that 760 Torr is exactly 1 atmosphere. A Torr is equivalent to 1 mm Hg on barometer readings taken at 0°C; at other temperatures, the conversion from mm Hg to . . . View Full Definition

Dow Theory: Dow theory maintains that major market trends depend on how the Dow Jones Industrial Average (DJIA) and the Dow Jones Transportation Average behave. They must move simultaneously in the same . . . View Full Definition

Mercury (Hg): Atomic number: 80, Atomic mass: 200.59 g.mol -1, Electronegativity: 1.9, Density: 13.6 g.cm-3 at 20°C, Melting point: - 38.9 °C, Boiling point: 356.6 °C, Vanderwaals radius: 0.157 nm, Ionic . . . View Full Definition

Microbarograph: A instrument designed to continuously record a barometer's reading of very small changes in atmospheric pressure.