Question

science n.c.e.r.t question define Low pressure

Answer 1

● The region where the force per unit area exerted is low, is called a low-pressure region.
● [Pressure = Thrust (force) / Area]
● Low pressure means the ratio of force to area will be lesser.

Answer 2

A low pressure area low or depression is a region on the topographic map where the atmospheric pressure is lower than that of surrounding locations. Low pressure systems form under areas of wind divergence that occur in the upper levels of the troposphere. The formation process of a low pressure area is known as cyclogenesis. Within the field of meteorology atmospheric divergence aloft occurs in two areas. The first area is on the east side of upper troughs which form half of a Rossby wave within the Westerlies a trough with large wavelength that extends through the troposphere. A second area of wind divergence aloft occurs ahead of embedded shortwave troughs which are of smaller wavelength. Diverging winds aloft ahead of these troughs cause atmospheric lift within the troposphere below which lowers surface pressures as upward motion partially counteracts the force of gravity.