PRESSURE Pressure is defined as the perpendicular force per unit area acting on a surface. It is a scalar quantity & measured in N/m2 or Pascal (pa).It can also be defined as the force per unit area, which is calculated by taking the total force and dividing it by the area over which the force […]
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Pressure is defined as the force acting normally (perpendicularly) per unit area . The SI units for pressure is newton per metre squared (N/m2). One Nm-2 is known as one Pascal (Pa). Pressure = normal force / area or pressure = thrust / area . Another unit for measuring pressure is the bar. 1 bar =
PRESSURE SYSTEMS IN THE WORLD Cyclone It’s a low pressure system characterised by low pressure at the centre and increases outwards. Starts in areas where air ascends from the ground to the atmosphere and descends at high altitude. It’s of two types. Tropical cyclones e.g. hurricane, typhoon and willy willies and depressions which are characterised
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ATMOSPHERIC PRESSURE Factors Influencing Atmospheric Pressure Altitude Pressure decreases with increase in altitude because the column of air becomes shorter hence it exerts less weight. Temperature When air is heated it expands and exerts pressure over a large area resulting in reduced pressure. When it’s cooled it contracts and exerts pressure over a small area
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The force exerted by gases in the atmosphere on some area or body on the earths surface. Measured using barometers of three types namely mercury, aneroid and Fortin Barometers How It Works Air exerts pressure on the mercury in the beaker. The height of mercury in the tube is proportional to the atmospheric pressure. The
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