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the pressure exerted by the mass of air above a given point, usually expressed in millibars, inches of mercury, or in hectopascals
standard atmospheric pressure
A pressure of 1013.25 mb, 29.92 inHg, 760 mmHg, 14.7 lbpsi, or 1013.25 hectopascals
a type of barometer that uses mercury to measure atmospheric pressure. The height of the mercury column is a measure of atmospheric pressure.
a map that shows the distribution of sea-level pressure with isobars and weather phenomena
an area of high atmospheric pressure around which the wind blows clockwise in the northern hemisphere and counterclock wise in the southern hemisphere
mid-latitude cyclonic storm
a cyclonic storm that most often forms along a front in middle and high latitudes
a line that connects points of equal elevation above a reference level, most often sea level
pressure gradient force
the force due to differences in pressure within the atmosphere that causes air to move and hence the wind to blow
A theoretical horizontal wind blowing in a straight path, parallel to the isobars or contours, at constant speed
the radial force required to keep an object moving in a circular path. It is directed toward the center of that path
meridional wind flow
a type of atmospheric circulation pattern in which the north-south component of the wind is pronounced
the atmospheric layer near the surface usually extending up to about 1 km where the wind is influenced by friction of the earth's surface and objects on it
the state of the atmosphere when there i a balance between the vertical pressure gradient force and the downward pull of gravity
a diagram that shows the percent of time that the wind blows from different directions at a given location over a given time
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