what is Atmospheric Pressure
It has been established , since long, that the year process some weight. Subsequently, it was also thought that the air, due to its weight must exert some pressure on the surface of the Earth.
Since the air compressible therefore its density is different at different heights. the density of air has also been found to verify from time to time due to the changes in its temperature and humidity.
It is to thus obvious that due to these difficulties the atmospheric pressure cannot be calculated as is done in the case of of liquids. How ever it is measured by the height of the column of liquid that it can support.
It has been observed that at sea level the pressure exerted by the column air of 1 square metre cross sectional area and of height equal to that of the atmosphere is 103 kN. Thus we may say that the atmospheric pressure at the sea level is 103 kN per m² (103kPa). It can also be expressed as 10.3 metres of water.
In terms of equivalent water column are 760 mm of mercury in terms of equivalent Mercury column.


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