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Changing densities

Quick changes in the weather are caused by movements of large bodies of air called air massesA large body of air that has similar characteristics.. Air masses usually cover very large areas. All the air in an air mass has nearly the same properties. When two air masses that have different densities meet, they mix slowly and form an area between them called a frontThe area between air masses of different temperatures or densities..

The density of an air mass is related to its pressure and temperature. Air densityThe ratio of the mass of a substance to the volume it occupies. is the amount of matter or mass in a specific volume. Increasing the temperature of a gas pushes its molecules farther apart. When the Sun heats up...

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1. Introduction
2. Surrounded by air
3. Oh, the pressure
4. Changing densities
5. Experiment 1 - Air Density: Does warm air take up less room than cool air?
6. Experiment 2 - Convection Currents: How can rising air cause weather changes?
7. Design Your Own Experiment