AIR PRESSURE

DEFINITION
AIR PRESSURE IS THE DOWNWARD FORCE EXERTED BY THE WEIGHT OF AIR PER UNIT AREA ON THE EARTH’S SURFACE.
AIR PRESSURE MAY VARY WITH ALTITUDE AND TEMPERATURE.
AIR PRESSURE IS GREATER AT THE SEA LEVEL AND DECREASES WITH INCREASING ALTITUDE.

INSTRUMENT USED
BAROMETER

BAROMETER

MERCURY BAROMETER

ANEROID BAROGRAPH

ANEROID BAROMETER

ISOBARS IS THE LINES ARE JOINING PLACES WITH EQUAL PRESSURE.
UNIT MEASUREMENT IS IN MILLIBARS
TYPES OF PRESSURE
RISING WARM AIR IS LESS DENSE AND EXERTS LOW PRESSURE.

SINKING COLD AIR IS MORE DENSE AND EXERTS HIGH PRESSURE.

AS THE RESULT OF THE DIFFERENCE IN AIR PRESSURE BETWEEN TWO PLACES WIND IS FORMED.

HIGH PRESSURE + LOW PRESSURE = WINDS

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