Density
The amount of atoms (particles) in a certain amount of space.
Hot Air Masses
Air that has less density so it rises up.
Cold Air Masses
Air that has more density so it sinks down.
Cold Front
When cold air moves toward warm air and pushes it up.
Warm Front
When warm air moves over cold air.
Occluded Front
When warm air is in between 2 areas of cold air.
Stationary Front
When warm air and cold air are pushing on each other. The wind is pushing hard so the warm air does not move up.
Cold Front Picture
Warm Front Picture
Occluded Front Picture
Stationary Front Picture
Warm Front Symbol
Cold Front Symbol
Occluded Front Symbol
Stationary Front Symbol
Air Pressure
The push caused by air.
Barometer
The tool used to measure air pressure.
High Pressure
Pressure that is above 30 in. on the barometer
Low Pressure
Pressure that is below 30 in. on the barometer
High Pressure Symbol
Low Pressure Symbol