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 ...

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 ...

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 ...