Because atmospheric pressure changes with distance above or below sea level, a barometer can also be used to measure altitude.
Barometers and pressure altimeters (the most basic and common type of altimeter) are essentially the same instrument, but used for different purposes. Get exclusive access to content from our 1768 First Edition with your subscription.
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Barometer, device used to measure atmospheric pressure.
Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. This article was most recently revised and updated by Our editors will review what you’ve submitted and determine whether to revise the article.Of the many different varieties of mercury barometers, most variations arise from different techniques for measuring the height of the mercury column.
The greater the air pressure, the higher the mercury rises. A barometer for measuring the pressure of the atmosphere in absolute terms is simply a manometer in which A barometer measures atmospheric pressure.
If water were used, for instance, the column would have to be 34 A barometer that mechanically records changes in barometric pressure over time is called a
The air in the atmosphere exerts a force called pressure that constantly changes due to moving weather systems. Pressure tendency can forecast short term changes in the weather. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
Originally, barometer referred to an instrument that measures atmospheric pressure.
It is one of the basic sensors included in weather stations.
Get kids back-to-school ready with Expedition: Learn! Although this meaning is still very much in use, the word has taken on a strongly figurative sense denoting something that signals changes in conditions not necessarily related to the weather.
This device is called the barometer. The function of a barometer is to Its density allows the vertical column of the barometer to be of manageable size. There are two main types of barometers: mercury and aneroid.
You can read the pressure off a scale marked onto the glass. History at your fingertips
Therefore, in conjunction with other meteorological instruments, this device can be used to help predict clear or rainy weather. Photo: A Torricellian barometer (sometimes called a mercury barometer) is an inverted (upside-down) glass tube standing in a bath of mercury. These tests paved the way for further studies in hydrodynamics and hydrostatics. A barometer is a measure of changing sentiment or an imminent trend reversal using a series of data points.
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