Air Pressure & Wind
1. Define air pressure.
2. Describe how changes in elevation, temperature, and humidity affect air pressure.
3. Explain what makes the wind blow.
air pressure isobar high-pressure area low-pressure area pressure gradient
We are constantly surrounded and buried in gas molecules. They allow us to move freely through them while constantly filling in behind us. We breath them in and out and use them to make energy within our bodies. They do have mass and can create widespread damage if moving at a high enough velocity. Below are some basic properties of gas molecules.
Atmospheric (air) pressure is the result of the mass of the molecules of gas and the gravity of the Earth.
The atmospheric pressure acts on the mercury reservoir causing the mercury to rise in the tube.
Changes in Air Pressure in the Atmosphere
Changes in pressure systems occur constantly in our dynamically changing atmosphere. Pressure changes drive the wind and establish weather systems. General rules governing pressure systems.
Winds are created by the pressure gradients in the atmosphere - the greater the pressure change the greater the wind.
Last modified: March 24, 2003