In a low pressure area there is a posibility of storm. Explain
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Storms are formed due to heating of the earth resulting in rise of the hot air creating a low presure zone which is surrounded by high pressure areas. This pressure difference creates winds to low from high pressure area to low pressure area resulting in the formation of storm.
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Air Pressure and How It Affects the Weather
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A barometer that measures air pressure using millibars (mb). Peter Dazeley/Getty Images
by Amanda Briney, Contributing Writer
Updated May 03, 2018
An important characteristic of the Earth's atmosphere is its air pressure, which determines wind and weather patterns across the globe. Gravity exerts a pull on the planet's atmosphere just as it keeps us tethered to its surface. This gravitational force causes the atmosphere to push against everything it surrounds, the pressure rising and falling as Earth turns.
What Is Air Pressure?
By definition, atmospheric or air pressure is the force per unit of area exerted on the Earth’s surface by the weight of the air above the surface.
The force exerted by an air mass is created by the molecules that make it up and their size, motion, and number present in the air. These factors are important because they determine the temperature and density of the air and thus its pressure.
The number of air molecules above a surface determines air pressure. As the number of molecules increases, they exert more pressure on a surface and the total atmospheric pressure increases. By contrast, if the number of molecules decreases, so too does the air pressure.
How Do You Measure It?
Air pressure is measured with a mercury or aneroid barometer. Mercury barometers measure the height of a mercury column in a vertical glass tube. As air pressure changes, the height of the mercury column does as well, much like a thermometer. Meteorologists measure air pressure in units called atmospheres (atm). One atmosphere is equal to 1,013 millibars (mb) at sea level, which translates into 760 millimeters of quicksilver when measured on a mercury barometer.
An aneroid barometer uses a coil of tubing with most of the air removed. The coil then bends inward when pressure rises and bows out when pressure drops. Aneroid barometers use the same units of measurement and produce the same readings as mercury barometers, but they don't contain any of the element.
Air pressure is not uniform across the planet, however. The normal range of the Earth's air pressure is from 980 mb to 1,050 mb. These differences are the result of low and high air pressure systems, which are caused by unequal heating across the Earth's surface and the pressure gradient force.
The highest barometric pressure on record was 1,083.8 mb (adjusted to sea level), measured in Agata, Siberia, on Dec. 31, 1968. The lowest pressure ever measured was 870 mb, recorded as Typhoon Tip struck the western Pacific Ocean on Oct 12, 1979.
Air Pressure and How It Affects the Weather
ShareFlipboardEmail

A barometer that measures air pressure using millibars (mb). Peter Dazeley/Getty Images
by Amanda Briney, Contributing Writer
Updated May 03, 2018
An important characteristic of the Earth's atmosphere is its air pressure, which determines wind and weather patterns across the globe. Gravity exerts a pull on the planet's atmosphere just as it keeps us tethered to its surface. This gravitational force causes the atmosphere to push against everything it surrounds, the pressure rising and falling as Earth turns.
What Is Air Pressure?
By definition, atmospheric or air pressure is the force per unit of area exerted on the Earth’s surface by the weight of the air above the surface.
The force exerted by an air mass is created by the molecules that make it up and their size, motion, and number present in the air. These factors are important because they determine the temperature and density of the air and thus its pressure.
The number of air molecules above a surface determines air pressure. As the number of molecules increases, they exert more pressure on a surface and the total atmospheric pressure increases. By contrast, if the number of molecules decreases, so too does the air pressure.
How Do You Measure It?
Air pressure is measured with a mercury or aneroid barometer. Mercury barometers measure the height of a mercury column in a vertical glass tube. As air pressure changes, the height of the mercury column does as well, much like a thermometer. Meteorologists measure air pressure in units called atmospheres (atm). One atmosphere is equal to 1,013 millibars (mb) at sea level, which translates into 760 millimeters of quicksilver when measured on a mercury barometer.
An aneroid barometer uses a coil of tubing with most of the air removed. The coil then bends inward when pressure rises and bows out when pressure drops. Aneroid barometers use the same units of measurement and produce the same readings as mercury barometers, but they don't contain any of the element.
Air pressure is not uniform across the planet, however. The normal range of the Earth's air pressure is from 980 mb to 1,050 mb. These differences are the result of low and high air pressure systems, which are caused by unequal heating across the Earth's surface and the pressure gradient force.
The highest barometric pressure on record was 1,083.8 mb (adjusted to sea level), measured in Agata, Siberia, on Dec. 31, 1968. The lowest pressure ever measured was 870 mb, recorded as Typhoon Tip struck the western Pacific Ocean on Oct 12, 1979.
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