Atmospheric pressure

What Is Atmospheric Pressure?

Atmospheric pressure is the weight of the air around us. It is the force that the air puts on everything, like you, the ground, and even trees. This pressure is all around us, but we cannot see it. At sea level, the pressure is about one atmosphere, which is the normal air pressure we feel every day.

Why Does Air Pressure Change?

Air pressure changes depending on where you are. The higher you go, the less air is above you, so the pressure gets lower. This is why it can feel harder to breathe on tall mountains. The weight of the air above us makes the pressure we feel. A tiny space of air, just one square centimeter wide, from the ground to the top of the sky, weighs about one kilogram!

How We Use Air Pressure

Knowing about air pressure helps us understand weather and how airplanes fly. Pilots use special tools called altimeter settings to adjust for air pressure so they can fly safely. Weather reports also talk about air pressure to tell us what the weather might do next.

Air pressure is important for many things, like knowing how high mountains are and why water boils at different temperatures in different places. Scientists have used air pressure for a long time to learn about our world.