Barometer – Definition

Barometer

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

Atmospheric Pressure

The pressure exerted by the atmosphere at a given point. Its measurement can be expressed in several ways. One is in millibars. Another is in inches or millimeters of mercury (Hg).

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-walled metal capsule or cell, usually made of phosphor bronze or beryllium copper. The scales on the glass cover measure pressure in both inches and millibars.

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 then temporarily sealed and placed into a cistern of mercury. A nearly perfect vacuum is established at the closed end after the mercury descends. The height of the column of mercury in the tube is a measurement of air pressure. As atmospheric pressure increases, the mercury is forced from the cistern up the tube; when the atmospheric pressure decreases, the mercury flows back into the cistern. Measurement is taken in inches of mercury. Although mercurial barometers are very accurate, practicality has led observers to use aneroid barometers. First used by Evangelista Torricelli (1608-1647), an Italian physicist and mathematician, to explain the fundamental principles of hydromechanics.

Service Area

Broward County: Andytown, Bonnie Loch-Woodsetter North, Boulevard Gardens, Broadview-Pompano Park, Broward Estates, Carver Ranches, Chambers Estates Chula Vista Isles, Coconut Creek, Collier Manor-Cresthaven, Cooper City, Coral Springs, Country Estates, Crystal Lake, Dania Beach, Davie, Deerfield Beach, Edgewater, Fort Lauderdale, Franklin Park, Golden Heights, Green Meadow, Hacienda Village, Hallandale Beach, Hillsboro Beach, Hillsboro Pines, Hillsboro Ranches, Hollywood, Ivanhoe Estates, Kendall Green, Lake Forest, Lauderdale-by-the-Sea, Lauderdale Lakes, Lauderhill, Lazy Lake, Leisureville, Lighthouse Point, Loch Lomond, Margate, Melrose Park, Miramar, North Andrews Gardens, North Lauderdale, Oak Point, Oakland Park, Palm Aire, Parkland, Pembroke Park, Pembroke Pines, Pine Island Ridge, Plantation, Pompano Beach, Pompano Beach Highlands, Pompano Estates, Ramblewood East, Ravenswood Estates, Riverland Village, Rock Island, Rolling Oaks, Roosevelt Gardens, Royal Palm Ranches, Sea Ranch Lakes, Southwest Ranches, St. George, Sunrise, Sunshine Acres, Sunshine Ranches, Tamarac, Tedder, Terra Mar, Utopia, Village Park, Washington Park, West Ken-Lark, West Park, Weston, Wilton Manors

Counties: Brevard, Broward, Collier, Hendry, Indian River, Lee, Martin, Miami-Dade, Monroe, Palm Beach, St Lucie

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