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QA INTERNATIONAL / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY QA INTERNATIONAL / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Because molecules obey the laws of gravity, the molecules in the gases that make up Eartha's atmosphere have a certain weight, which we bear constantly without being aware of it. Atmospheric pressure is the force that air exerts by weighing on a given area. At sea level, this pressure is equivalent to an average of 1,013 hPa, or 1.013 kg per cm2. Various factors, such as altitude and temperature, can create zones of high and low atmospheric pressure. These variations are directly linked to major meteorological phenomena.
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