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Atmospheric pressure refers to the force exerted by the air at the Earth's surface on a unit area, which is caused by the gravity at the Earth's surface acting on the gas molecules in the atmosphere. Below is the definition of atmospheric pressure, how it is measured, and its impact on weather and the environment. definition Atmospheric pressure, usually measured in kilograms   ( k pa ), is the pressure created by the weight of air molecules near the Earth's surface. It is the average force of gas molecules in the Earth's atmosphere on the Earth's surface, reflecting the weight of the air. The standard atmospheric pressure (1 standard atmospheric pressure) is approximately 101.3 k pa . measure Atmospheric pressure is usually measured using a barometer, which is a scientific instrument. Traditional barometers use a mercury or android   barometer to measure changes in air pressure by observing changes in the height of the mercury column. Modern barometers use technol...