Why? Because of the many factors which affect atmospheric pressure. Pioneering scientists discovered atmospheric pressure (also known as barometric or air pressure) in the 17th century ...

The sun, however, heats the Earth’s surface unevenly, which creates different areas of low and high atmospheric pressure. When a high interacts with a low, wind occurs as air moves from the high ...

Air molecules colliding with a surface cause atmospheric pressure. Atmospheric pressure at sea level is about 101,000 Pa (101 kPa) but just 27,000 Pa (27 kPa) at the cruising altitude of a ...