ETYM Greek baros weight + -meter: cf. French baromčtre.
Instrument registering atmospheric pressure, especially for weather forecasting.
Instrument that measures atmospheric pressure as an indication of weather. Most often used are the mercury barometer and the aneroid barometer.
In a mercury barometer a column of mercury in a glass tube, roughly 0.75 m/2.5 ft high (closed at one end, curved upward at the other), is balanced by the pressure of the atmosphere on the open end; any change in the height of the column reflects a change in pressure. In an aneroid barometer, a shallow cylindrical metal box containing a partial vacuum expands or contracts in response to changes in pressure.
An instrument that measures atmospheric pressure. + prikaži više